Ichthammol ointment is a thick, dark, tar-like preparation used on human skin primarily to draw out infections from boils, splinters, and ingrown hairs, and to manage inflammatory skin conditions such as eczema, psoriasis, and seborrheic dermatitis. It has been in continuous use since the late 1800s, yet most people encounter it without knowing much about what it is or how it works. The ointment sits in an unusual place in modern medicine: widely available over the counter, trusted by generations of users, but supported more by long clinical tradition than by large randomized trials.
What Ichthammol Actually Is
Ichthammol is derived from oil shale, a type of sedimentary rock rich in fossilized organic material. The shale is heated to extract oil, which is then treated with sulfuric acid and neutralized with ammonia. The result is a complex mixture of sulfonated compounds, mainly sulfonated thiaarenes, which are ring-shaped molecules containing sulfur. This is the version described by the European and U.S. pharmacopeias.1PubMed. Regulatory Challenges for Look-Alike and Sound-Alike Non-Biological Complex Drugs: Molecular Fingerprint Discrimination of Ichthammol Formulations The sulfur content is what gives ichthammol much of its therapeutic character, as sulfur has a long history in dermatology for its antibacterial and keratolytic properties.
The ointment you find at a pharmacy is usually ichthammol mixed with a base like petrolatum or lanolin, typically in concentrations of 10% or 20%. The 20% version is more common for drawing applications, while 10% is sometimes preferred for larger areas of inflamed skin. It is almost black, extremely sticky, and has a strong, distinctive smell often compared to tar or asphalt. These cosmetic drawbacks are the main reason people tend to use it only when they really need it.
Drawing Out Boils, Splinters, and Abscesses
The most popular use of ichthammol ointment in everyday life is as a “drawing salve.” When applied to a boil or a deep splinter, the ointment is believed to soften the skin, increase blood flow to the area, and help bring the infection or foreign body closer to the surface. For boils specifically, the idea is that ichthammol encourages the boil to come to a head, making it easier for the trapped pus to drain either on its own or with medical assistance.
This drawing effect has been a staple of home treatment for generations. People apply a thick layer of ichthammol over the boil, cover it with a bandage, and leave it overnight. The routine is usually repeated daily until the boil opens and drains. Many users report that it speeds up the natural progression of a boil from a painful, deep lump to a draining lesion that can then heal. The mechanism is not fully understood in scientific terms, but the ointment’s ability to soften the epidermis and its mild anti-inflammatory properties likely play a role.
The same principle applies to embedded splinters and insect stingers. A dab of ichthammol under an occlusive bandage can soften the surrounding tissue enough for a shallow foreign body to work its way out or become easier to extract with tweezers. This is a more practical trick than a medical claim, but it has enough anecdotal support to keep ichthammol stocked in first-aid kits across rural communities and among people who work outdoors.
Eczema and Other Inflammatory Skin Conditions
Beyond the drawing-salve reputation, ichthammol has a more clinical history in managing chronic inflammatory skin problems. It has been used to treat eczematous dermatitis, psoriasis, seborrheic dermatitis, leg ulcers, and furuncles.2South Asian Research Journal of Pharmaceutical Sciences. Efficacy of Topical Ichthammol in Treatment of Mild Plaque Psoriasis In dermatology, ichthammol’s appeal for these conditions comes from its combination of anti-inflammatory, mild antibacterial, and anti-itch properties all in one preparation.
For eczema, ichthammol is sometimes used as an alternative to topical steroids, particularly when patients need to take a break from prolonged steroid use. Steroid creams, while effective, can thin the skin over time, and ichthammol offers a non-steroidal option that can help soothe itching and reduce redness. Dermatologists occasionally prescribe ichthammol paste in bandages, sometimes called ichthopaste bandages, which are wrapped around limbs affected by eczema or venous leg ulcers. The bandage delivers the ointment continuously while also protecting the skin from scratching.
In seborrheic dermatitis, ichthammol can help reduce the oily scaling on the scalp and face. Some medicated shampoos include ichthammol as an active ingredient, though these are less common now than shampoos based on ketoconazole or zinc pyrithione. Still, ichthammol-based products persist as an option for people who prefer older, non-prescription remedies or who have not responded well to the more mainstream alternatives.
Ichthammol for Psoriasis
Psoriasis is one of the more interesting applications for ichthammol, because it is a condition where patients often cycle through multiple treatments over the years and may welcome any additional option. Ichthammol has been applied to mild plaque psoriasis, the most common form, where thickened, scaly patches develop on the elbows, knees, scalp, and lower back.2South Asian Research Journal of Pharmaceutical Sciences. Efficacy of Topical Ichthammol in Treatment of Mild Plaque Psoriasis The ointment’s keratolytic action, meaning its ability to soften and loosen the outer layer of dead skin cells, can help reduce the thick scaling that characterizes psoriatic plaques.
Ichthammol is not a first-line treatment for psoriasis by any modern guideline. Topical corticosteroids, vitamin D analogs, and newer biologics dominate psoriasis management. But for patients with mild disease who want to minimize their exposure to steroids, or who cannot access more expensive treatments, ichthammol remains a recognized option in the dermatological toolkit. Its long safety record is a practical advantage for patients who need something they can use consistently over weeks or months.
How to Apply It
Using ichthammol ointment is straightforward, but a few practical tips make the experience less messy. The ointment is genuinely sticky and will stain anything it touches, including clothing, bedsheets, and light-colored surfaces. You should always cover the application site with a bandage or gauze pad.
- For boils: Clean the area gently, apply a thick layer of 20% ichthammol directly over the boil, cover with a gauze pad and secure with medical tape. Change the dressing once or twice daily. Continue until the boil drains or you see a healthcare provider.
- For splinters: Apply a small amount over the entry point, cover tightly with a bandage, and leave on for several hours or overnight. Check whether the splinter has surfaced enough to remove with clean tweezers.
- For eczema or psoriasis: Apply a thin layer to affected areas as directed by your dermatologist. Ichthopaste bandages, if prescribed, are wrapped around the limb and left in place for days at a time before changing.
- For ingrown hairs: Dab a small amount on the ingrown hair, cover with a bandage, and leave overnight. The softening effect on the surrounding skin can help the trapped hair break through.
Disposable gloves are helpful when applying the ointment, since it will blacken your fingers and resist washing off with just soap and water. If you do get it on your hands, an oil-based cleanser or rubbing alcohol works better than regular soap.
Safety and Side Effects
Ichthammol has a remarkably good safety profile for a product that has been used for well over a century. It is generally well tolerated, and serious adverse reactions are rare. The most common complaint is skin irritation at the application site, which tends to be mild and resolves when you stop using the product. Allergic contact dermatitis is possible but uncommon.
A few precautions are worth noting. Ichthammol is for external use only and should not be applied to open wounds, deep puncture wounds, or severe burns. It should not be used near the eyes or on mucous membranes. If you are applying it to a boil that has already begun draining, be aware that introducing any ointment into an open lesion carries some risk of trapping bacteria, so keeping the area clean matters more than piling on more product.
Pregnant and breastfeeding individuals should check with a healthcare provider before using ichthammol, not because specific harm has been documented, but because formal safety data in these groups is limited, as is the case with many older remedies that predate modern regulatory requirements. For children, ichthammol is generally considered safe when used externally, though pediatric guidance from a provider is sensible for any persistent skin condition.
When to See a Doctor Instead
Ichthammol works well for minor skin issues, but there are situations where self-treating with a drawing salve can delay necessary care. A boil that is larger than a golf ball, surrounded by spreading redness, accompanied by fever, or located on the face (particularly near the nose or eyes) should be evaluated by a healthcare provider. Facial boils carry a risk of spreading infection toward the brain via interconnected veins, and no over-the-counter ointment is a substitute for medical drainage and antibiotics in that scenario.
Similarly, recurrent boils, defined as three or more episodes in a year, often indicate nasal carriage of Staphylococcus aureus or another underlying factor that ichthammol alone will not address. If you find yourself reaching for the drawing salve every few months, a provider can evaluate whether you need a decolonization protocol or further workup.
For chronic skin conditions like psoriasis and eczema, ichthammol can be a useful adjunct, but it is not a replacement for a proper diagnosis. Psoriasis in particular can be confused with fungal infections, eczema, and other conditions that require different treatments. If you are self-diagnosing based on what the rash looks like, you could be treating the wrong problem entirely.
The Smell and Staining Problem
It would be dishonest to write about ichthammol without addressing the elephant in the room: the smell. Ichthammol has a strong, sulfurous, bituminous odor that most people find unpleasant. The smell is not dangerous, but it is persistent enough that you may want to apply the ointment at bedtime rather than before going to work or socializing. The odor fades somewhat once the ointment is covered with a bandage, but it does not disappear entirely.
Staining is the other practical headache. The ointment is nearly black and will ruin fabric on contact. Old sheets and dark clothing are your friends during treatment. The staining on skin is temporary and will fade over a day or two after you stop applying the product, but it can look alarming in the meantime. These downsides explain why many people only use ichthammol as a last resort, even when they know it works, and why the product has never become a mainstream cosmetic or daily skincare ingredient despite its anti-inflammatory properties.
Why the Evidence Base Is Thin
If you search for clinical trials on ichthammol, you will find surprisingly little compared to most modern drugs. This is not because the product is ineffective; it is because ichthammol was already in widespread use long before the era of randomized controlled trials. No pharmaceutical company holds a lucrative patent on it, which means there is no financial incentive to fund large trials. The compound is inexpensive, available generically, and sold over the counter in many countries. From a business standpoint, nobody profits from proving that a cheap, unpatented salve works.
This creates a paradox where ichthammol’s long track record of clinical use provides a kind of real-world evidence that many newer drugs lack, while simultaneously falling short of the gold standard that modern evidence-based medicine demands. Dermatologists who use it tend to rely on clinical experience and tradition, prescribing it alongside better-studied treatments rather than instead of them. The compound’s inclusion in the European and U.S. pharmacopeias indicates that regulators consider it a legitimate pharmaceutical substance, even if its evidence base would not satisfy a modern drug approval panel.1PubMed. Regulatory Challenges for Look-Alike and Sound-Alike Non-Biological Complex Drugs: Molecular Fingerprint Discrimination of Ichthammol Formulations
Ichthammol Versus Other Drawing Salves
Ichthammol is sometimes confused with other products marketed as drawing salves. Some over-the-counter drawing salves contain different active ingredients entirely, including compounds like kaolin (a type of clay), activated charcoal, or various herbal extracts. These products trade on the same folk-medicine concept of “drawing out” infection or foreign material, but their ingredients and mechanisms differ from ichthammol’s sulfur-based chemistry.
A more concerning category is so-called “black salve,” which contains escharotic agents like bloodroot (sanguinarine) or zinc chloride. These products are marketed for drawing out skin cancers, moles, and other growths, and they work by chemically burning and destroying tissue. Black salve is not ichthammol, and the two should never be confused. Health agencies in multiple countries have issued warnings against black salve because it can cause severe tissue destruction, disfiguring scars, and delayed treatment of actual skin cancers. Ichthammol, by contrast, is not corrosive and does not destroy tissue. If you see a drawing salve marketed with claims about removing tumors or skin cancers, that is a different and dangerous product.
Veterinary Crossover
You may notice that ichthammol ointment is sold in large tubs at farm supply stores alongside horse care products. This is not a coincidence. Ichthammol is widely used in veterinary medicine, especially for horses, to treat hoof abscesses, minor wounds, and skin conditions. The equine version is the same basic substance, though it may come in different concentrations or bases than the product sold for human use in pharmacies.
Some people buy the larger, cheaper veterinary-sized containers and use them on themselves. While the active ingredient is identical, veterinary formulations are not manufactured under the same quality controls as products intended for human use. The base ingredients, preservatives, and purity standards may differ. If cost is a concern, the human-labeled product at the pharmacy is still inexpensive by any standard, and sticking with it avoids any ambiguity about what you are putting on your skin.
The veterinary connection does highlight something genuine about ichthammol: it is one of the few topical preparations that has maintained credibility across both human and animal medicine for over a century. That kind of staying power, in the absence of aggressive marketing or patent protection, speaks to a product that enough practitioners and patients have found useful enough to keep using.