A fibroma is a benign tumor made up of fibrous or connective tissue. The term is broad, covering dozens of growths that can appear in skin, bone, the mouth, the foot, the ovaries, tendons, and elsewhere. Most fibromas are painless, slow-growing, and not cancerous, though some subtypes can be locally aggressive or cause significant discomfort depending on where they form. Because “fibroma” is an umbrella label rather than a single diagnosis, understanding which type you have matters far more than the word itself.
Skin Fibromas
The most commonly encountered fibroma is the dermatofibroma, a small, firm bump that usually appears on the legs, arms, or trunk. Dermatofibromas are benign skin tumors composed of fibrous tissue and histiocytes, and they are one of the most familiar growths in dermatology. They typically feel like a hard pea under the skin, and pressing one from the sides may cause a characteristic dimpling of the overlying skin. Most are under a centimeter across and cause no symptoms beyond mild cosmetic concern.
Not all dermatofibromas follow the typical script. An atrophic variant, for example, presents as a depressed or concave area of skin rather than a raised bump, which can mimic scarring or other skin conditions and delay diagnosis until a biopsy confirms fibrous tumor cells in the deeper skin layers.1PubMed Central. A Rare Case of Atrophic Dermatofibroma Featuring Linear Skin Dimple Another uncommon variant is the aneurysmal dermatofibroma, a blood-filled growth that can enlarge rapidly, ooze, and recur after appearing to shrink, sometimes reaching several centimeters and mimicking a malignancy on first glance.2PubMed. Giant aneurysmal benign fibrous histiocytoma (dermatofibroma) These variants are rare, but they illustrate why an unusual-looking skin lump deserves a clinical evaluation rather than a guess.
Skin tags, which many people casually call fibromas, are technically soft fibromas or fibroepithelial polyps. They share the fibrous-tissue origin but are floppy, flesh-colored flaps of skin rather than firm nodules. They tend to appear where skin rubs against skin or clothing and are almost never a medical concern.
Oral Fibromas
Inside the mouth, fibromas rank among the most common benign growths. The typical oral fibroma is an irritation fibroma, also called a traumatic fibroma, a smooth, round, painless lump of connective tissue that develops in response to repeated trauma like cheek biting, lip chewing, or rubbing against a rough tooth edge or orthodontic appliance.3PubMed Central. Understanding the Distinction Between Traumatic Fibroma and Mucocele in Pediatric Patients: A Report of Two Cases Nearly 40% show up on the inner cheek lining, with the tongue, lip, hard palate, and gums making up most of the remaining cases.4PubMed Central. Biting Fibroma of the Lower Lip: A Case Report and Literature Review on an Irritation Fibroma Occurring at the Traumatic Site of a Tooth Bite
These growths are usually the same color as the surrounding tissue, firm to the touch, and less than two centimeters across. They are reactive, meaning the body is depositing scar-like connective tissue in response to a source of chronic irritation rather than undergoing uncontrolled cell growth. Removing the source of trauma sometimes prevents recurrence, but if the fibroma is bothersome, excision is straightforward.
A related but distinct lesion is the peripheral ossifying fibroma, which appears on the gums and contains mineralized tissue alongside the fibrous component. It tends to grow more aggressively than a standard irritation fibroma and has a higher tendency to recur after removal, so follow-up is important.
Plantar Fibromas and Ledderhose Disease
A plantar fibroma is a firm nodule embedded in the plantar fascia, the thick band of tissue on the bottom of your foot. When multiple nodules develop or the fascia itself thickens and contracts, the condition is called plantar fibromatosis or Ledderhose disease. The nodules usually form in the central or medial arch area and grow slowly over months to years.5PubMed Central. Ledderhose’s Disease: An Up-to-Date Review of a Rare Non-Malignant Disorder
Ledderhose disease shares a biological family tree with Dupuytren’s contracture of the hand and Peyronie’s disease, all of which involve abnormal proliferation of collagen and fibroblasts in fibrous tissue. The cause is not fully understood, but associations have been noted with diabetes, liver disease, alcohol consumption, use of certain anticonvulsants, and prior trauma to the foot.5PubMed Central. Ledderhose’s Disease: An Up-to-Date Review of a Rare Non-Malignant Disorder
For many people the nodule itself is the only sign, a lump they notice when walking barefoot or pressing on the arch. But when painful Ledderhose disease is present, the pressure pattern of walking shifts: studies using pressure sensors have found that affected individuals push more force through the heel and toes while unloading the midfoot, an unconscious compensation for the painful nodule under the arch.6PubMed. Effect of painful Ledderhose disease on dynamic plantar foot pressure distribution during walking: a case-control study That altered gait can eventually create secondary discomfort in the heel or forefoot. In one surgical series examining tissue from patients with stubborn heel pain that had not responded to typical treatments, about a quarter of the specimens turned out to contain plantar fibromas, suggesting these growths are sometimes an overlooked source of foot pain.7PubMed. Proximal plantar fibroma as an etiology of recalcitrant plantar heel pain
Bone Fibromas
Non-ossifying fibromas are one of the most common bone lesions in children and teenagers. They form in growing bones, particularly around the knee and in the lower leg, and are usually discovered by accident when an X-ray or scan is taken for an unrelated reason.8PubMed Central. Imaging of Non-ossifying Fibromas: A Case Series Most occur in the metaphysis of long bones, the region near the growth plate, and tend to migrate toward the center of the bone shaft as the skeleton matures.9PubMed. Nonossifying Fibroma Involving Epiphysis of Long Bone-Case Report and Review of the Literature
On an X-ray, they look like well-defined oval or irregular lucencies with a thin sclerotic border, their long axis running parallel to the bone.10PubMed Central. Cortical fibrous defects and non-ossifying fibromas in children and young adults: The analysis of radiological features in 28 cases and a review of literature The main concern with non-ossifying fibromas is not malignant transformation, which essentially does not happen, but the possibility of a pathological fracture if the lesion weakens enough of the bone’s cortex. Many resolve on their own as the child grows, filling in with normal bone. When they are large enough to threaten the bone’s structural integrity, curettage and grafting is the standard treatment.
A closely related lesion, the fibrous cortical defect, is smaller and confined entirely to the cortex. It is so common in the pediatric population that many radiologists consider it a normal developmental variant rather than a true tumor.
Ossifying fibromas of the jaw are a separate entity. These occur in the jawbones, most often the mandible, and contain a mix of fibrous tissue and bone-like mineralized material. In rare cases they are part of a genetic syndrome called hyperparathyroidism-jaw tumor syndrome, where jawbone tumors appear alongside overactive parathyroid glands.11PubMed Central. Ossifying fibroma of the jaw bones in hyperparathyroidism-jaw tumor syndrome: Analysis of 24 cases retrieved from literatures In that setting, the fibroma can precede any signs of abnormal calcium levels, making the jaw tumor itself an early diagnostic clue.
Tendon Sheath Fibromas
Fibromas of the tendon sheath are slow-growing, well-defined lumps that arise from the tissue surrounding a tendon, most often in the hand or fingers. They are composed of dense fibrous stroma, which gives them a characteristically low signal on all MRI sequences, sometimes helping radiologists distinguish them from other soft-tissue masses.12PubMed Central. A Fibroma of Tendon Sheath Causing Carpal Tunnel Syndrome: A Case Report of an Atypical Clinical Presentation Most present as painless lumps, though when they form within the carpal tunnel or other tight spaces, they can compress nerves and produce symptoms like numbness or tingling. Treatment is surgical excision, and recurrence rates are low.
Ovarian Fibromas
Ovarian fibromas are uncommon solid tumors of the ovary that arise from the stromal (connective tissue) cells. They are benign but can sometimes create a striking clinical picture. When an ovarian fibroma is accompanied by fluid accumulation in the abdomen and a pleural effusion around the lungs, the combination is called Meigs syndrome, a diagnosis that resolves completely once the tumor is surgically removed.13PubMed Central. Case Report: Ovarian fibroma: typical presentation with Meigs’s Syndrome
The challenge with ovarian fibromas is that they can be difficult to diagnose before surgery. A solid ovarian mass with fluid in the abdomen naturally raises concern for ovarian cancer, and the blood marker CA-125 can be elevated in both conditions. The distinction is usually confirmed only after the tumor is removed and examined under a microscope. In younger women, surgery aims to preserve the ovary by removing just the fibroma; in older or postmenopausal patients, the entire ovary and fallopian tube are typically removed.14Obstetrics Gynecology and Reproductive Sciences. Meigs syndrome revealed by bilateral ovarian fibroma in postmenopausal woman
Desmoid Tumors and Aggressive Fibromatosis
Not all fibromas are harmless lumps you can forget about. Desmoid tumors, also called desmoid-type fibromatosis, are fibrous growths that sit in a gray zone between benign and malignant. They do not spread to distant organs, but they can invade surrounding tissues aggressively, wrapping around muscles, nerves, and blood vessels in ways that make them difficult or impossible to remove cleanly.15PubMed Central. Desmoid-Type Fibromatosis They account for a tiny fraction of all tumors, roughly 0.03%, but their behavior is disproportionately impactful for the people who have them.16Annals of Oncology. Update on desmoid tumors
Most desmoid tumors arise sporadically and are driven by mutations in the CTNNB1 gene, which leads to abnormal accumulation of a protein called beta-catenin inside cells.17PubMed. A comparison of the usefulness of nuclear beta-catenin in the diagnosis of desmoid-type fibromatosis among commonly used anti-beta-catenin antibodies A smaller proportion, roughly 5 to 15%, are hereditary and linked to mutations in the APC gene, the same gene involved in familial adenomatous polyposis (Gardner syndrome).15PubMed Central. Desmoid-Type Fibromatosis The hereditary form tends to develop in the abdomen, while sporadic cases can appear in the limbs, abdominal wall, or trunk.
Treatment has shifted over the past two decades. Surgery used to be the default, but high recurrence rates after excision led many centers to adopt a wait-and-watch approach for tumors that are stable and tolerable. Some desmoids even regress on their own. When treatment is needed, options include anti-hormonal therapy, chemotherapy, targeted drugs, and radiation, though the best choice depends heavily on the tumor’s location and behavior.
Living With Desmoid Fibromatosis
Because desmoid tumors often develop in young adults and can persist or recur for years, their burden extends well beyond the physical lump. Pain is the most debilitating symptom for many patients, and it does not always respond well to standard painkillers. Patients report functional limitations that affect daily activities like dressing, bathing, and carrying children, and many give up hobbies and physical activities they once enjoyed.18PubMed Central. Desmoid fibromatosis through the patients’ eyes: time to change the focus and organisation of care?
In a large patient survey, about a third of respondents fell into a high symptom burden group, characterized by worse quality-of-life scores and more frequent visits to healthcare providers compared to those with lower symptom burden.19PubMed Central. Physical symptom burden in patients with desmoid-type fibromatosis and its impact on health-related quality of life and healthcare use Pain, fatigue, and reduced mobility scored significantly worse in people with an active tumor compared to those whose tumor had been treated or resolved.20ESMO Open. Patient-reported symptom severity and impact of desmoid tumors: an analysis of the Desmoid Tumor Research Foundation natural history study Emotional distress is a persistent theme in patient accounts, driven by the unpredictable course of the disease and the frustration of dealing with a condition that many doctors have never seen.
How Fibromas Are Treated
Treatment varies enormously depending on the type, location, and symptoms of the fibroma. The majority of benign fibromas need no treatment at all if they are asymptomatic and clearly identified. A small dermatofibroma on the leg or a skin tag on the neck can be left alone indefinitely without any risk.
When removal is desired, surgical excision is the standard approach for most types. Oral fibromas are typically the simplest to address. The traditional method uses a scalpel under local anesthesia, but diode lasers have become increasingly popular in dental settings because they can reduce bleeding and eliminate the need for sutures.21PubMed Central. Clinical Outcomes of Oral Traumatic Fibroma Removal Using a 980 nm Diode Laser: A Series of Four Cases Laser excision has been reported to be more effective than conventional surgery, electrosurgery, and cryosurgery at reducing pain and bleeding for oral soft-tissue growths.22PubMed Central. Removal of an Extra-large Irritation Fibroma With a Combination of Diode Laser and Scalpel The technique is safe even in very young patients; case reports describe successful laser excision of oral fibromas in neonates with no recurrence after more than a year of follow-up.23PubMed Central. 940 nm Diode Laser assisted excision of Peripheral Ossifying Fibroma in a neonate
Plantar fibromas that cause pain can be treated conservatively at first with orthotics, padding, physical therapy, or corticosteroid injections to reduce discomfort. If those fail, surgical excision of the nodule or a wider fasciotomy may be needed, though recurrence is a known challenge, especially if only the nodule and not the surrounding affected fascia is removed.
Deeper fibromas, such as those arising from tendon sheaths or in soft tissues near joints, are removed surgically when they cause pain or interfere with function. Imaging with ultrasound or MRI is usually done beforehand to map the tumor’s size and relationship to surrounding structures.24PubMed Central. US and MRI appearance of a collagenous fibroma (desmoplastic fibroblastoma) of the shoulder Collagenous fibromas, also called desmoplastic fibroblastomas, are rare slow-growing tumors that favor the subcutaneous tissue or muscle of the shoulder, arm, or back. They occur more often in men and tend to appear in the fifth through seventh decades of life.25Europe PMC. Collagenous fibroma (desmoplastic fibroblastoma) with vertebral body erosion Despite occasionally reaching large sizes, they do not recur after complete excision.
Fibromas in Children
Several fibroma types are specific to, or most commonly seen in, pediatric patients. Non-ossifying fibromas of bone, as described above, are overwhelmingly a childhood and adolescent finding. In the mouth, peripheral ossifying fibromas can occur even in neonates, where a gum mass at birth requires excision to confirm it is not something more concerning.23PubMed Central. 940 nm Diode Laser assisted excision of Peripheral Ossifying Fibroma in a neonate
A much rarer condition, juvenile hyaline fibromatosis, is a genetic disorder caused by mutations in the ANTXR2 gene. Children develop multiple painless soft-tissue swellings, often on the ears, forehead, and scalp, that recur after surgical removal.26PubMed Central. Juvenile Hyaline Fibromatosis: Report of a Case with a Novel ANTXR2 Gene Mutation The swellings are composed of abnormal collagen deposits, and while surgical excision is the main treatment, repeated operations are often needed because of high recurrence rates. Joint contractures and gum overgrowth can also develop, making management a long-term effort.
Genetic Syndromes Linked to Fibromas
Most fibromas are isolated, one-off events with no genetic significance. But there are situations where fibromas appear as part of a broader inherited pattern. Multiple small fibromas on the fingers and toes have been observed in patients with germline mutations in tumor-suppressor genes, including conditions like tuberous sclerosis and neurofibromatosis type 1. The observation has led researchers to propose that multiple acral fibrous tumors, though individually benign, could serve as a skin-level clue that a tumor-suppressor gene is mutated, a marker with low sensitivity but potentially high specificity.27PubMed. Multiple acral fibromas in a patient with familial retinoblastoma: a cutaneous marker of tumour-suppressor gene germline mutation?
The hereditary connection to desmoid tumors through familial adenomatous polyposis is clinically important as well. Patients with this inherited colon-cancer predisposition syndrome can develop desmoid tumors, sometimes in the abdominal mesentery after colon surgery, which complicates their care significantly. If a young person develops a desmoid tumor without an obvious cause, screening for APC gene mutations may be warranted.
When a Fibroma Might Not Be a Fibroma
The word “fibroma” reassures most people because it signals something benign. But the real diagnostic question is usually not what to call the lump but what to rule out. A firm, growing mass on the skin could be a dermatofibroma, or it could be a dermatofibrosarcoma protuberans, a slow-growing malignancy that looks deceptively similar but invades deeper tissue. A bone lesion that resembles a non-ossifying fibroma on imaging could, in unusual presentations, overlap with aneurysmal bone cysts or other lesions that require different treatment.8PubMed Central. Imaging of Non-ossifying Fibromas: A Case Series An ovarian fibroma can be difficult to distinguish from ovarian cancer until tissue is examined after surgery.
This is why the path to calling something a fibroma almost always runs through imaging, biopsy, or both. A doctor who tells you “it’s probably a fibroma” based on physical exam alone is often right, especially for common presentations like skin tags or oral irritation fibromas. But for any lump that is growing, painful, deep, or located in an unusual site, tissue sampling is the gold standard for confirming the diagnosis and ruling out something that needs more aggressive treatment.
Fibromas in Animals
Fibromas are not limited to humans. Dogs, cats, cattle, and other animals develop connective-tissue tumors with the same basic histology. In veterinary medicine, fibromas are among the differential diagnoses for rapidly enlarging masses. A case report of a fibroma in a dog, for instance, described a subcutaneous mass near the eye that was cured by excision, with no recurrence after nearly a year.28PubMed Central. Lateral canthal fibroma in a dog In deer, fibromas caused by a papillomavirus produce warty skin growths that hunters sometimes encounter. The veterinary perspective is a useful reminder that fibromas are a fundamental pattern in connective tissue biology across species, not something unique to human physiology.