African black soap has real potential for mild eczema, but it comes with trade-offs that make it a mixed choice for inflamed or broken skin. Some of its ingredients are genuinely soothing and moisturizing, while others, particularly its high pH, can work against the skin barrier you’re trying to protect. Whether it helps or hurts depends on the severity of your eczema, how you use it, and what version of the soap you buy.
What’s Actually in Black Soap
Traditional African black soap is made from a short list of plant-based ingredients: plantain skins, cocoa pod ash, palm kernel oil, and often shea butter, coconut oil, or honey. The plantain skins and cocoa pods are burned to create an ash that acts as a natural lye, which is what turns the oils into soap. This process gives the soap its dark color and rough, crumbly texture.
The finished soap has a high fat content, around 55% total fatty matter in traditionally made versions. That’s significantly more than many commercial soaps and means black soap leaves more of a moisturizing film on skin after rinsing. Shea butter, when included, adds compounds like vitamin E, plant sterols, and phenols that act as antioxidants and help form a protective barrier on the skin’s surface. Rather than adding moisture directly, shea butter locks in the moisture already there and reduces water loss.
The soap also has documented antimicrobial activity against Staphylococcus bacteria, which is relevant for eczema. Staph bacteria commonly colonize eczema-prone skin and can trigger flares or secondary infections, so a cleanser that reduces that bacterial load has a real advantage.
The pH Problem
Here’s where things get complicated. Healthy skin sits at a slightly acidic pH of around 4.5 to 5.5. That acidity is part of what keeps the skin barrier intact, fights off harmful bacteria, and retains moisture. In people with eczema, the skin’s pH already shifts toward alkaline, which worsens barrier dysfunction and makes skin more vulnerable to irritation and infection.
African black soap is alkaline. Lab measurements of traditional black soap samples consistently show pH values between 8.7 and 9.7, well above the skin’s natural range. Every bar soap made with lye is alkaline to some degree, but this matters more for eczema-prone skin because the barrier is already compromised. Washing with an alkaline cleanser can temporarily raise skin pH even further, potentially increasing dryness and irritation in the hours after washing. Research on cleansers for atopic dermatitis has found that all traditional soaps tested were highly alkaline, which is why many dermatologists recommend soap-free or pH-balanced cleansers for eczema instead.
Benefits for Mild Eczema
People do use black soap to manage mild rashes from eczema, dermatitis, psoriasis, and skin allergies. Cleveland Clinic dermatologist Dr. Shilpi Khetarpal (Dr. Vij) acknowledges this use, though notes more research is needed to confirm these benefits. The soap’s gentle exfoliating texture removes dead skin cells, its antimicrobial properties help keep bacterial counts down, and its high fat content means it’s less stripping than many conventional soaps.
If your eczema is mild, mostly involves dry or flaky patches rather than open or weeping skin, and you’ve been frustrated by reactions to fragrances and synthetic ingredients in commercial products, a plain, unscented black soap could be worth trying. The ingredient list is short and transparent compared to many drugstore cleansers, which reduces your exposure to common contact allergens like artificial fragrance, preservatives, and surfactants.
Risks for Sensitive or Flaring Skin
The same rough texture that makes black soap a good exfoliant can irritate actively inflamed skin. Mechanical exfoliation on a flare can make the condition worse rather than better. Raw black soap often contains small particles of plantain skin or ash that feel gritty, and rubbing those across red, cracked, or broken skin is likely to sting and cause further irritation.
Some of the natural ingredients in black soap are themselves potential allergens. Cocoa and shea butter can trigger reactions in sensitive individuals. Commercial versions of black soap (liquid formulations or branded products labeled “African black soap”) frequently add fragrances, tea tree oil, and other botanical extracts that increase the risk of contact dermatitis. One analysis of a popular African black soap shampoo found it contained multiple known contact allergens including fragrance, tea tree oil, and tocopherol. If you’re going to try black soap for eczema, the traditional raw bar is a safer bet than a reformulated commercial product.
How to Use It Safely
If you want to test black soap on eczema-prone skin, how you apply it matters as much as the soap itself. Don’t rub the bar directly on your skin. The rough surface and loose particles can scratch and irritate. Instead, cut or pull off a small piece and dissolve it in water to create a smoother lather, or work it between your hands first and apply only the foam. You can also lather it onto a soft washcloth before touching it to your skin.
Start by using it on a small, non-inflamed area and wait 24 to 48 hours to see how your skin responds. If there’s no stinging, redness, or increased dryness, you can gradually expand use. Avoid using it on actively flaring patches, open skin, or weeping eczema. Rinse thoroughly, since leftover alkaline residue sitting on skin will continue to disrupt your barrier. Follow immediately with a fragrance-free moisturizer or emollient while your skin is still damp to counteract the drying effect of the alkaline wash and seal in hydration.
Daily use is common for people with normal skin, but with eczema, less frequent use (every other day or a few times a week) may be a better starting point. Pay attention to how your skin feels in the hours after washing. If it feels tight, itchy, or looks redder, the soap’s pH is likely too harsh for your skin, and a pH-balanced, soap-free cleanser would serve you better.
Traditional vs. Commercial Black Soap
There’s a meaningful difference between a raw black soap bar and the commercial products sold under the “African black soap” name. Traditional bars are soft, dark brown to black, crumbly, and have an earthy smell. They contain a handful of recognizable plant ingredients and no synthetic additives. Commercial liquid versions or reformulated bars often add surfactants, fragrances, preservatives, and botanical extracts that can trigger the very skin reactions you’re trying to avoid.
If eczema management is your goal, read labels carefully. A product labeled “African black soap” that contains a long ingredient list with fragrance, sodium lauryl sulfate, or multiple plant extracts is a fundamentally different product from the traditional bar. The short, simple ingredient profile is one of raw black soap’s genuine advantages for reactive skin, and that advantage disappears the moment a manufacturer adds common irritants back in.