Skin tags are small, soft, flesh-colored or slightly darker growths that hang off the skin on a thin stalk. They look like tiny deflated balloons or teardrop-shaped flaps of skin, typically between one and five millimeters across, though they can occasionally grow larger. Most are painless, and many people don’t notice them until they catch on jewelry or clothing. Recognizing a skin tag is usually straightforward once you know the key features, but a handful of other skin growths can mimic their appearance closely enough to cause confusion.
The Classic Appearance
A typical skin tag, known in medical terminology as an acrochordon, has a few defining visual characteristics. It is a soft, pliable bump that protrudes from the skin surface on a narrow connecting piece called a peduncle, or stalk. This stalk is the single most useful identification feature: while moles sit flush against the skin and warts tend to have a broad, rough base, skin tags dangle. They move freely when you nudge them, and they can be gently pinched between two fingers without any firm or gritty resistance underneath.
Color ranges from matching your surrounding skin tone almost exactly to slightly darker brown. In people with lighter skin, they often appear pinkish or tan. In people with darker skin, they tend to be the same shade or a bit deeper. One clinical study found that skin tags of mixed coloring were more common in people with diabetes than in those without, suggesting the color can sometimes shift depending on underlying health factors.1PubMed Central. A Clinical Evaluation of Skin Tags in Relation to Obesity, Type 2 Diabetis Mellitus, Age, and Sex When a skin tag becomes irritated or twisted on its stalk, it can turn red, purple, or even black as its blood supply gets cut off. A darkened skin tag is not necessarily dangerous, but it can look alarming.
The surface texture is smooth and usually slightly wrinkled, somewhat like crinkled tissue paper. Under a dermoscope, skin tags typically show small dots and coiled blood vessels running through them, which helps dermatologists confirm what they are.2PubMed. Skin tags imaged by reflectance confocal microscopy, optical coherence tomography and multispectral optoacoustic tomography at the bedside To the naked eye, though, you just see a smooth, squishy little flap.
Size Range and Shape Variations
Most skin tags are tiny, roughly the size of a grain of rice up to about the size of a pencil eraser. Many go unnoticed for months or years. They can be so small they feel like a slight bump when you run your fingers over your skin, especially in areas like the neck or underarms.
Shape is not always uniform. Some are round, some oval, some irregularly lobed. A few develop a broader base rather than a slender stalk, making them harder to distinguish from other growths. The stalk itself can range from a thin thread of tissue to a somewhat wider attachment. Flat or broad-based skin tags are the ones most often confused with moles or warts, so the presence of a stalk, even a short one, is the feature worth looking for first.
On rare occasions, skin tags can grow much larger. Growths over five centimeters are considered giant acrochordons and are extremely unusual. A case report documented a large vulvar skin tag in an elderly woman that had been left untreated for years, eventually reaching a size that required surgical removal.3PubMed Central. A Large Vulvar Acrochordon in an 80-Year-Old Woman: A Neglected Hanging Lesion Cases like this are outliers. For the vast majority of people, skin tags stay small and remain a cosmetic issue rather than a medical one.
Where They Show Up
Skin tags strongly favor areas where skin folds over itself or rubs against skin, clothing, or accessories. The most common locations are the neck, underarms (axillae), groin folds, under the breasts, and on the eyelids. They also appear along the bra line, beneath a belt line, or wherever friction is a regular part of daily life. One case report described a patient who developed multiple skin tags arranged in a straight line, strongly suggesting that repeated rubbing along that strip of skin triggered their formation.4PubMed. Friction induced skin tags
Less commonly, skin tags appear on the back, chest, or genital area. Finding a skin tag in an unexpected spot does not change what it is, but if you have a growth in an area not typically associated with friction or skin folds, it is worth having a professional take a look. Growths on the genitals, in particular, can be confused with warts or other conditions that benefit from early diagnosis.
Telling Skin Tags Apart from Lookalikes
Several other skin growths share enough features with skin tags to create genuine confusion. Knowing what each of these looks like, and how it differs, saves a lot of unnecessary worry.
- Warts: Warts caused by human papillomavirus (HPV) are typically firmer, have a rougher surface with tiny black dots (clotted capillaries), and sit on a broad base rather than dangling from a stalk. They often appear on hands, feet, and genital areas. Interestingly, there is clinical overlap: a wart and a skin tag can occasionally coexist on the same lesion, making visual distinction tricky even for dermatologists.5Oxford Academic / PubMed Central. Verruca plus acrochordon: an ‘over the top’ skin tag
- Moles: Moles (melanocytic nevi) are usually flat or only slightly raised, have a uniform round shape, and feel firmer than skin tags when pressed. They do not dangle. A mole’s color tends to be more consistent and deeply pigmented compared with the variable, lighter tone of most skin tags.
- Seborrheic keratoses: These waxy, stuck-on-looking growths are common after age 40 and can be tan, brown, or almost black. They are broader, rougher, and feel like they are pasted onto the skin rather than hanging from it. They lack the stalk that defines a skin tag.
- Neurofibromas: Soft, skin-colored bumps associated with neurofibromatosis can look remarkably similar to skin tags, especially when they are small. They tend to be slightly rubbery and can indent when pressed, a feature called “buttonholing.” Multiple neurofibromas appearing alongside café-au-lait spots on the skin may signal an underlying genetic condition that warrants evaluation.
- Skin cancers: Some basal cell carcinomas and amelanotic melanomas can present as small, flesh-colored bumps. The key difference is that skin cancers tend to change in size, shape, or color over time, may bleed or crust, and rarely have the classic thin stalk of a skin tag. Any growth that is evolving, bleeding, or painful deserves a professional assessment.
The stalk remains the single most reliable visual clue in everyday self-checks. If a growth dangles on a narrow piece of tissue, moves freely, and is soft to the touch, it is far more likely to be a skin tag than any of the above. When there is no clear stalk, or when a growth is changing, getting harder, or becoming painful, the safest move is to have it looked at.
Who Gets Skin Tags and When
Skin tags are remarkably common. A study of 750 unselected individuals found that 46% carried at least one skin tag, with the risk increasing steadily with age until around 50, after which the rate of new tags tended to plateau.6PubMed. Skin tags: localization and frequencies according to sex and age That same study found slightly higher prevalence in men than women, though other research has reported the opposite. In practice, skin tags are common across sexes.
Pregnancy is a well-known trigger. Hormonal shifts and weight gain during pregnancy increase both friction in skin folds and the kinds of metabolic changes associated with skin tag growth. Many people notice new skin tags appearing in the second or third trimester, particularly around the neck and under the arms. Some of these shrink or fall off after delivery, though many persist.
Children and teenagers can develop skin tags too, though it is less common. When a young person develops many skin tags, or when they appear alongside other unusual skin findings, a doctor may want to rule out genetic conditions. In most cases, though, a single skin tag on a child is no more worrisome than it would be on an adult.
The Connection to Weight and Metabolic Health
If you have a lot of skin tags, the research suggests it is worth paying attention to your metabolic health. There is a well-established link between skin tags and both obesity and insulin resistance. A study comparing people with and without skin tags found that the skin tag group had a significantly higher average body mass index (about 28 versus 24 in the control group).7PubMed Central. The Correlation between Body Mass Index with the Occurrence of Skin Tag Higher body weight creates more skin folds and more friction, which helps explain the mechanical side of this relationship.
But weight alone does not tell the full story. Research has found that skin tags are independently associated with insulin resistance even after adjusting for BMI, diabetes diagnosis, age, and sex. One study reported that people with elevated insulin resistance scores were about seven and a half times more likely to have skin tags compared to those with normal insulin sensitivity.8PubMed. Association between skin tags and insulin resistance Insulin and insulin-like growth factors can stimulate skin cell proliferation, which may help explain why metabolic issues manifest on the skin in this particular way.
This does not mean that every person with skin tags has diabetes or is prediabetic. Plenty of lean, metabolically healthy people develop them. However, someone who suddenly develops many skin tags, particularly across multiple body sites, should consider having their fasting glucose and insulin levels checked. For some people, skin tags have turned out to be the first visible clue of an underlying metabolic issue that had not yet produced obvious symptoms.
What Causes Skin Tags to Form
The underlying cause is not fully settled, but the best evidence points to a combination of mechanical irritation, hormonal influences, and possibly viral involvement. Friction is the most consistently cited trigger, supported by the fact that tags overwhelmingly appear in skin fold areas and can form in linear patterns following lines of chronic rubbing.4PubMed. Friction induced skin tags
The role of human papillomavirus has been debated for decades. Some studies have detected HPV DNA in a high proportion of skin tags. One early study found HPV types 6 and 11 in 88% of skin tags examined.9PubMed. The detection of human papillomavirus DNA in skin tags A later study using a different detection method found HPV DNA in about 49% of skin tag samples, while surrounding normal skin tested negative.10PubMed. Human papillomavirus and skin tags: Is there any association? These findings suggest HPV may contribute to or accelerate skin tag formation in some cases, but the inconsistency between studies, and the fact that plenty of skin tags show no HPV at all, means the virus is not the whole explanation. Skin tags are not considered contagious in everyday life.
Under a microscope, a skin tag consists of a core of loose connective tissue covered by a papillated (gently ridged) outer skin layer.11International Journal of Pathology and Clinical Research. Reduced and Thinned Elastic Fibers in Skin Tag The connective tissue contains blood vessels and sometimes fat cells, but no hair follicles or other complex skin structures. Elastic fibers in that connective tissue are often thinner and reduced compared with normal skin, which may explain the loose, floppy texture. Essentially, a skin tag is an overgrowth of perfectly normal skin components arranged in an abnormal way, which is why it is classified as a benign growth rather than a tumor.
When a Skin Tag Needs Medical Attention
Skin tags virtually never become cancerous. The transformation of a benign skin tag into a malignant growth is so rare that it is essentially limited to isolated case reports in the medical literature. Removing skin tags is almost always done for comfort or cosmetic reasons, not out of medical necessity.
That said, there are situations where you should see a doctor rather than trying to self-diagnose or self-treat:
- Rapid growth: A skin tag that is enlarging quickly or changing color over weeks could be something else entirely.
- Bleeding or crusting: True skin tags do not spontaneously bleed unless they are physically torn or twisted. A growth that bleeds on its own warrants evaluation.
- Hard texture: Skin tags are soft. A firm or hard bump, even if it looks like a tag, may be a different type of growth.
- Pain without irritation: Skin tags can become sore when they snag on clothing or jewelry, but a growth that is persistently painful without an obvious mechanical cause should be examined.
- Sudden appearance of many tags: Developing dozens of skin tags over a short period, especially in someone who hasn’t had them before, can signal hormonal changes, weight gain, or insulin resistance. It is worth a checkup.
Self-removal carries real risks. Tying off a skin tag with thread, cutting it with scissors, or applying over-the-counter “mole and skin tag removal” products can cause infection, scarring, and incomplete removal. More importantly, self-treating a growth that has been misidentified as a skin tag can delay diagnosis of something more serious. If removal is desired, a dermatologist can clip, freeze, or cauterize a skin tag quickly with minimal discomfort.
Skin Tags During Pregnancy
Pregnancy is one of the most common times for skin tags to appear, and it can be especially frustrating for people who have never had them before. The combination of rising estrogen and progesterone, increased blood volume, weight gain, and more friction in areas like the underarms and beneath the breasts creates a near-perfect environment for skin tag formation. Tags that appear during pregnancy are identical in appearance to those at any other time: soft, flesh-toned, dangling on a stalk.
Some pregnancy-related skin tags regress on their own in the months following delivery as hormone levels normalize and body composition shifts. Others stick around permanently. Removal during pregnancy is generally deferred unless a tag is causing significant discomfort, since the ones that do resolve tend to shrink slowly without intervention. If new growths appear during pregnancy that do not fit the typical skin tag profile, a dermatologist can evaluate them. Pregnancy also brings other benign skin changes, including darkened patches and small red blood vessel spots, that sometimes get confused with skin tags.
The HPV Question and Whether Skin Tags Are Contagious
The detection of HPV DNA in skin tags, reported in studies spanning from the late 1990s through the 2000s, occasionally prompts concern about whether skin tags can spread to other people through contact. The short answer is that skin tags are not considered contagious. The HPV types found in skin tags, primarily types 6 and 11, are the same low-risk strains associated with genital warts and laryngeal papillomas, but the presence of viral DNA in a skin tag does not mean the tag itself functions as an active viral lesion.9PubMed. The detection of human papillomavirus DNA in skin tags
It is also worth noting that the surrounding normal skin in study subjects tested negative for HPV, even when the skin tags themselves were positive.10PubMed. Human papillomavirus and skin tags: Is there any association? This suggests that any viral involvement is localized to the tag tissue rather than representing a broader skin infection. Researchers have gone back and forth on what the HPV findings actually mean: whether the virus plays an active role in triggering the growth, or whether it simply takes up residence in tissue that was already growing abnormally for other reasons. For practical purposes, you do not need to worry about skin tags being infectious.
Skin Tags Versus Genital Warts
One area where misidentification causes genuine anxiety is the genital region. Both skin tags and genital warts can appear in the groin folds, on the vulva, around the anus, and on the penile shaft. The visual differences are usually clear when you know what to look for, but the stakes of getting it wrong are higher here than on the neck or underarms.
Genital warts tend to be flatter, firmer, and often have a rough or cauliflower-like surface texture. They may appear in clusters and can spread to new areas. Skin tags in the genital area are soft, typically solitary or appear in small numbers, and have the same smooth surface and dangling stalk seen elsewhere on the body. Genital skin tags are more common than many people realize, particularly in the creased skin of the groin and along the perianal area, and they carry no sexually transmitted infection risk.
If there is any ambiguity, a healthcare provider can usually tell the difference with a quick visual exam. In uncertain cases, a biopsy settles the question definitively. Because genital warts are caused by HPV and have implications for sexual health and cancer screening, the cost of misidentifying one as a harmless skin tag is meaningfully higher than the reverse. When in doubt in this area of the body, get it checked.
What a Dermatologist Sees That You Cannot
When viewed with specialized imaging, skin tags reveal features invisible to the naked eye. Dermoscopy, a technique that uses a magnifying lens with polarized light, shows the coiled blood vessels and dot patterns within a skin tag’s connective tissue core.2PubMed. Skin tags imaged by reflectance confocal microscopy, optical coherence tomography and multispectral optoacoustic tomography at the bedside These vascular patterns help dermatologists distinguish a skin tag from other soft growths when the appearance is ambiguous.
Newer imaging methods like reflectance confocal microscopy and optical coherence tomography can visualize the internal structure of a skin tag without cutting it. These tools show the layered architecture and the reduced elastic fibers that give skin tags their characteristic floppiness. In everyday practice, most skin tags are diagnosed on sight and never need imaging. But for atypical or borderline-looking lesions, the technology exists to characterize them without a biopsy, which is particularly useful for growths on the face or eyelids where scarring matters.
For most people, the combination of location, softness, a visible stalk, and lack of change over time is enough to confidently identify a skin tag at home. The situations that genuinely warrant a professional opinion are the exceptions outlined above: growths that are changing, bleeding, hard, painful, or appearing in large numbers without an obvious explanation. In those cases, what looks like a skin tag may turn out to be something else entirely, and a short visit is worth the peace of mind.