Drawing salve has been used on skin lumps for well over a century, but there is no clinical trial evidence that it can resolve a true cyst. The reason comes down to anatomy: most cysts are enclosed sacs sitting beneath the skin surface, and a topical ointment applied on top of intact skin has limited ability to reach or break down that capsule. Drawing salves can soften and loosen the outer layers of skin, which is why they sometimes help with superficial boils and abscesses, but a cyst is a fundamentally different structure. The distinction matters more than most people realize, and confusing the two is where a lot of the folk reputation of drawing salve comes from.
What “Drawing Salve” Actually Refers To
The term drawing salve gets applied to at least two very different products, and the difference between them is not cosmetic. The traditional, widely available version sold at pharmacies is based on ichthammol, a dark, tar-like substance derived from shale oil. Ichthammol has been used in dermatology for conditions like eczematous dermatitis, psoriasis, and boils (furuncles) for over a hundred years and is generally considered safe for topical use.1PubMed. Ichthammol revisited It smells strong, stains fabric, and has a reputation as an old-fashioned but functional remedy.
The other product sometimes called drawing salve is black salve, which is an entirely different and far more dangerous substance. Black salve typically contains bloodroot extract (rich in the alkaloid sanguinarine), zinc chloride, and other caustic compounds. It does not “draw” anything out. It destroys tissue on contact, creating a dead layer of skin called an eschar.2PubMed Central. Black salve: risky escharotic These two products share a name in casual conversation but have almost nothing in common pharmacologically, and lumping them together has led to real harm. The rest of this article treats them separately, because they deserve separate answers.
How Ichthammol Interacts with Skin
The folk claim about ichthammol-based drawing salves is that they “pull” infections or foreign material to the surface. The actual mechanism is less dramatic but still interesting. A 2022 study using three-dimensional skin models found that ammonium bituminosulfonate (the active compound in ichthammol) loosens the outer layers of the skin in a concentration-dependent way. The ointment decreased expression of filaggrin and laminin, two proteins that help hold skin cells together and anchor layers of the epidermis. The result was increased skin permeability, meaning substances could pass through the skin barrier more easily.3PubMed. In vitro investigation of the principle of action of ammonium bituminosulfonate ointments on a 3D skin model
That loosening effect is consistent with the long clinical tradition of applying ichthammol over a boil to help it “come to a head.” If a shallow abscess is already close to the surface, softening the overlying skin could plausibly help the contents drain. The study authors described this as facilitating pus extraction and treatment of deep inflammations.3PubMed. In vitro investigation of the principle of action of ammonium bituminosulfonate ointments on a 3D skin model But this was an in-vitro experiment on lab-grown skin, not a clinical trial on human patients with cysts. And even within that lab setting, the effect was on the epidermis, the outermost skin layer. The deeper structures where cysts typically sit were not part of the model.
Why Cysts Are Not the Same as Boils
This is the crux of the issue, and where most of the anecdotal success stories about drawing salve fall apart on closer inspection. A boil (furuncle) is a localized skin infection, usually caused by bacteria getting into a hair follicle. It produces a pocket of pus relatively close to the surface, and the body’s immune response naturally pushes it outward. With or without drawing salve, most boils will eventually rupture and drain on their own. Ichthammol may speed that process along by softening the overlying skin, and people interpret the result as the salve “working.”
A cyst is structurally different. The most common types people try to treat at home are epidermoid cysts (sometimes incorrectly called sebaceous cysts), which consist of a sac lined with skin cells that produce keratin. The sac is self-contained, sitting in the dermis or subcutaneous tissue, and it is not trying to come to the surface. There is no pus pushing outward, no natural drainage pathway for a topical ointment to assist. Even if ichthammol loosens the epidermis above the cyst, the cyst wall itself remains intact underneath. As long as that wall exists, the cyst will refill.
This is why the internet is full of people who report temporary improvement after applying drawing salve to a cyst, only to have it return weeks or months later. If a cyst becomes inflamed or secondarily infected, it can look and feel exactly like a boil, and in that situation drawing salve might help the infected contents drain through the skin surface. But the underlying cyst sac is still there, and recurrence is the norm. A dermatologist would say the salve treated the infection, not the cyst.
The Black Salve Problem
When people go searching for something stronger than ichthammol, they sometimes land on black salve, and this is where a folk remedy becomes genuinely dangerous. Black salve is an unregulated preparation whose active ingredients include sanguinarine (from bloodroot) and zinc chloride, both of which are caustic enough to destroy living tissue. Laboratory research has confirmed that sanguinarine is highly cytotoxic, killing skin cells at very low concentrations, and that other alkaloids in black salve boost its cell-killing effect.4PubMed Central. Understanding of black salve toxicity by multi-compound cytotoxicity assays An analysis of commercially available black salve products found that the majority contain high concentrations of cytotoxic alkaloids and zinc chloride expected to result in significant tissue destruction.5Journal of Herbal Medicine. Black salve composition: An evaluation of the potential for normal tissue toxicity and treatment failure from black salve products
What black salve does to the skin is not subtle. When applied, it kills the tissue beneath it, forming a thick scab (eschar) surrounded by redness and pain. The tissue underneath does not heal cleanly. Published case reports describe patients applying black salve to skin nodules they believed were cysts. In one case, a man applied a commercially sold black salve product to a nodule on his neck and left it on for seven days, hoping it would remove the cyst. He ended up needing medical treatment for the wound instead.6PubMed Central. Black salve: risky escharotic – Section: Case report Secondary infection is a common outcome of applying black salve to skin lesions.7Cureus. Black Salve: A Dangerous Corrosive Disguised as an Alternative Medicine
Black salve cannot selectively target a cyst. It destroys whatever tissue it touches, healthy or otherwise. If applied over a cyst, it will burn through the skin above it, potentially creating an open wound, but it will not neatly remove the cyst wall or drain the contents in a controlled way. The scarring can be severe, and the wound may become infected. Online testimonials showing dramatic “extractions” are typically showing tissue necrosis, not a cyst being safely removed.
The Risk of Self-Treating Any Lump
Beyond the question of whether a salve works, there is a more serious problem with applying anything to a skin lump without a diagnosis. Not every bump under the skin is a benign cyst. Published case reports have documented skin conditions initially diagnosed as benign that turned out to be cancers, including breast carcinoma, cutaneous lymphoma, and squamous cell carcinoma. In those cases, delayed recognition led to misguided treatment and worse outcomes.8PubMed. Uncommon neoplasms mistakenly diagnosed as hidradenitis suppurativa: Report of three consecutive cases
If a trained dermatologist can mistake a malignancy for a benign condition, a person at home with a tube of drawing salve has even less chance of making the right call. Using black salve on a malignant lesion is particularly dangerous because it can destroy the surface tissue that a pathologist would need to biopsy, making accurate diagnosis harder after the fact. And using any drawing salve on a lump can delay the point at which someone seeks conventional care for conditions that have effective, evidence-based treatments.2PubMed Central. Black salve: risky escharotic
This does not mean you need to rush to the doctor over every tiny bump. But if a lump is growing, painful, has been present for more than a few weeks, or sits in an area where you cannot clearly see it, having it evaluated before self-treating is worth the effort. A quick office visit can distinguish a harmless epidermoid cyst from something that needs different management.
What Actually Gets Rid of a Cyst
If drawing salve cannot resolve a true cyst, what can? The definitive treatment is surgical excision, where a doctor removes the entire cyst including its wall. This is a minor outpatient procedure done under local anesthesia, and it is the only approach with a low recurrence rate. The key is removing the sac intact. If the wall ruptures during removal and fragments are left behind, the cyst can regrow from those remnants.
For inflamed cysts that are too swollen to excise cleanly, the usual approach is a two-step process. First, the inflammation is treated, sometimes with a corticosteroid injection into the cyst, sometimes with incision and drainage if there is infection. Once the area has calmed down, the cyst is excised electively. Trying to cut out an actively inflamed cyst leads to higher recurrence rates because the wall is fragile and more likely to break.
Some people live with cysts for years without issue. If a cyst is small, painless, and not cosmetically bothersome, leaving it alone is a reasonable choice. Cysts are not pre-cancerous and do not need to be removed for medical reasons unless they are causing symptoms. The decision to treat is usually driven by discomfort, infection, or appearance.
Warm compresses are sometimes recommended to help an inflamed cyst settle down, and they are a safer home option than drawing salve. The warmth increases blood flow to the area, which can help the immune system manage any low-grade infection. Warm compresses will not make the cyst disappear permanently, but they are unlikely to cause harm and can reduce pain while you wait for a medical appointment.
When Ichthammol Might Reasonably Help
Given everything above, is there any situation where ichthammol-based drawing salve is a reasonable thing to use? The honest answer is: maybe, in a narrow set of circumstances. If you have a cyst that has become infected and is starting to behave like a boil, with redness, warmth, and a white or yellow head forming near the skin surface, ichthammol applied under a bandage may help soften the overlying skin and allow the infected contents to drain more easily. You are not treating the cyst itself. You are helping the acute infection resolve, which is genuinely useful and may save you an urgent-care visit.
The evidence for this is not based on clinical trials. It is based on ichthammol’s demonstrated ability to loosen skin and increase permeability,3PubMed. In vitro investigation of the principle of action of ammonium bituminosulfonate ointments on a 3D skin model combined with a long history of dermatological use for furuncles and similar conditions.1PubMed. Ichthammol revisited It is plausible rather than proven. If you try it and the area gets worse, more swollen, more painful, or develops spreading redness, stop and see a doctor. Those are signs of a worsening infection that needs antibiotics or drainage, not more ointment.
What ichthammol will not do, even in the best case, is eliminate the cyst permanently. The sac will still be there. If recurrent infections are a problem, that is a strong argument for elective excision rather than repeated cycles of inflammation, drawing salve, and temporary relief.
The Skin Barrier and Why Topical “Cures” Face a Hard Ceiling
One reason topical products in general struggle with deep skin conditions is that healthy skin is an extraordinarily effective barrier. The outermost layer, the stratum corneum, is specifically evolved to keep foreign substances out. Research on transdermal delivery has shown that even small ions like magnesium barely cross intact skin from simple solutions, with permeation strongly limited by the stratum corneum.9PubMed. Does magnesium permeate the skin? An ex vivo investigation of magnesium ion delivery through intact and barrier-disrupted skin If a simple charged ion cannot get through, the idea that a thick ointment will penetrate deep enough to dissolve a cyst wall sitting in the dermis or subcutis is a stretch.
This is not a failure of drawing salves specifically. It is a limitation of any topical approach for a deep, encapsulated structure. Pharmaceutical companies spend enormous resources developing transdermal delivery systems for drugs that need to reach the bloodstream, and even those often require chemical enhancers, electrical currents, or microneedles to push molecules past the stratum corneum. A drawing salve in a tin has none of those advantages. It can affect the surface layers of skin, and that is essentially where its reach ends.
Products marketed online as topical cyst-dissolving remedies, whether they contain ichthammol, herbal extracts, or proprietary blends, face this same barrier. The marketing suggests the product penetrates to the cyst and breaks it down. The biology suggests it does not. Until someone publishes a controlled trial showing a topical agent can resolve an intact epidermoid cyst, claims about drawing salve “working” on cysts remain anecdotal, and the anecdotes are almost certainly confusing cysts with boils or describing temporary drainage of infected cyst contents rather than permanent resolution.
Pilonidal and Other Deep Cysts
Drawing salve questions often come from people dealing with pilonidal cysts, which form near the tailbone and are notoriously painful and prone to recurrence. These cysts develop in a different way than epidermoid cysts, typically involving ingrown hair and chronic irritation in the natal cleft, but the drawing salve logic is the same: a topical ointment cannot reach or destroy the sinus tracts that sustain a pilonidal cyst. If a pilonidal cyst becomes acutely infected and forms a superficial abscess, ichthammol might help soften the skin over the collection, but the underlying sinus problem will remain.
Pilonidal disease often requires surgical management, ranging from simple incision and drainage for acute flare-ups to more extensive procedures like excision or flap closure for chronic or recurrent disease. People who repeatedly apply drawing salve to pilonidal cysts instead of seeking surgical evaluation may end up with more complex disease by the time they do see a surgeon, because chronic inflammation can extend the sinus tracts and make definitive repair harder.
Ganglion cysts, which appear on wrists or fingers and contain a jelly-like fluid rather than keratin, are another type people sometimes try to treat with drawing salve. These cysts arise from joint capsules or tendon sheaths and have no connection to the skin surface at all. No topical product can reach them. The historical treatment for ganglion cysts was smashing them with a heavy book, which tells you something about the history of home remedies for cysts but is also not recommended. Aspiration (draining with a needle) or surgical excision are the standard options if a ganglion cyst is bothersome.