What Is African Black Soap — And Is It Really Good for Eczema?
If you're a life-long eczema warrior, you've probably tried more products than you can count. Gentle washes that still sting. Moisturising washes that leave a residue. Fragrance-free formulas that somehow still cause a reaction. And somewhere in that exhausted search, you may have come across traditional African black soap — a dark, earthy-looking ingredient with centuries of history and a growing reputation in natural skincare circles.
But does it actually help with eczema? Or is it just another trend?
This is a question we take seriously at Rukai Botanicals, because African black soap — Ose Dudu in Yoruba — is at the heart of what we do. So let's go through it properly: what traditional black soap actually is, where it comes from, why it's been used for generations on sensitive and troubled skin, and what you need to know before trying it on eczema-prone skin.
What Is African Black Soap?
African black soap is a traditional cleanser originating from West Africa, used for centuries across Ghana, Nigeria, Togo and surrounding regions. Despite its name, it's not always black — it can range from dark brown to golden, depending on the ingredients and the region it comes from.
The traditional recipe varies by community, but the core ingredients typically include:
- Plantain skin ash — the ash is what gives the soap its characteristic dark colour and creates its alkaline, deeply cleansing base
- Cocoa pod ash — adds to the lathering quality and contributes natural antioxidants
- Shea butter — the conditioning agent that balances the soap's cleansing power with moisture
-
Coconut oil or palm kernel oil — provides additional lather and moisturising properties
What makes traditional black soap significant is what it doesn't contain: synthetic detergents, artificial fragrances, sulphates, parabens, or the long list of petrochemical derivatives found in most commercial body washes. It's a whole-ingredient product in the truest sense.
In Yoruba culture, where our founder Rukayat's heritage lies, this soap is called Ose Dudu — literally translating to "black soap" — and it has been used not just for cleansing but for soothing skin rashes, managing scalp conditions, and caring for babies' delicate skin for generations.
Why Might African Black Soap Help with Eczema?
In short, eczema can be caused by a variety of factors - gut, allergies etc but is fundamentally a skin barrier problem. The skin's protective outer layer — the stratum corneum — is weakened, allowing moisture to escape and irritants to get in. This constant cycle of dryness, inflammation and itching is what makes eczema so persistent and so frustrating.
Here's why African black soap is worth considering for eczema-prone skin:
It cleanses without stripping
Most conventional body washes use sulphates (like sodium lauryl sulphate or sodium laureth sulphate) to create that satisfying lather we've all come to know. The problem is that sulphates are surfactants — think of it like detergents. They don't just remove dirt and oil, they strip the skin's natural lipid barrier making it dryer. For someone with eczema, that means every shower potentially makes things worse.
The cleansing agents in traditional black soap are derived from plant ash rather than synthetic sulphates. They clean just as effectively but far more gently, leaving the skin's natural oils — and its barrier — more intact.
It contains natural anti-inflammatory ingredients
Several of the core black soap ingredients have documented anti-inflammatory properties. For example, Shea butter, which contains a high concentration of triterpenes — naturally occurring compounds that have been shown to calm inflammation. Plantain (the cooking banana, not the herb) contains allantoin, which is soothing and promotes cell regeneration. It also makes for a tasty treat!
These aren't miracle cures. But they mean you're cleansing with soothing ingredients that are actively working with your skin, rather than against it.
It's naturally free from the most common eczema triggers
Fragrance is the single most common contact allergen in skincare — it's estimated to trigger reactions in up to 11% of people with eczema. Traditional African black soap contains no synthetic fragrance. It has its own earthy, natural scent from the plant ingredients, but nothing added.
Similarly, it contains no dyes, no preservatives, and no alcohol.
Raw Black Soap vs. Formulated Black Soap: What's the Difference?
This is an important distinction that we feel doesn't get talked about enough.
Raw African black soap — the kind you might buy as a solid block directly imported from Ghana — is undeniably authentic. But it can actually be problematic for very sensitive or eczema-prone skin. Raw black soap has a naturally high pH (often around 9–11), which is significantly more alkaline than healthy skin (which sits at around pH 5.5). Washing with a very alkaline product regularly can disrupt the skin's acid mantle, potentially worsening the very barrier dysfunction that causes eczema.
This doesn't mean raw black soap is bad — it works beautifully for many people. But if your skin is reactive or currently flaring, starting with a raw soap can be too intense.
Formulated black soap — this is where traditional black soap extract is incorporated into a pH-balanced, moisturising base — offering the benefits of the ingredient with a gentler delivery. This is the approach we took with our Ose Dudu African Black Soap Body Wash: the black soap is the hero ingredient, but it's formulated alongside aloe vera, neem, glycerin and oat extract to create something genuinely suitable for sensitive and eczema-prone skin, at a skin-friendly pH.
What to Look for When Choosing a Black Soap Product for Eczema
Not all products marketed as "African black soap" are equal. So here's the lowdown on what to check for:
Ingredients to look for:
- Authentic black soap extract or black soap base ingredients listed in the first few ingredients
- Shea butter or another emollient to add conditioning
- Aloe vera or oat extract for additional soothing
- Glycerin for humectant moisture
Ingredients to avoid (especially for eczema):
- Synthetic fragrance or parfum — even in a "natural" product
- Sulphates (SLS, SLES)
- Alcohol listed high in the ingredient list
- Essential oils — despite their natural credentials, essential oils like lavender and tea tree are among the most common contact sensitisers for eczema sufferers
Patch test first. Numero uno thing to do - even with the most thoughtful formulation, everyone's skin is different. Apply a small amount to the inside of your elbow for 24–48 hours before using all over to soothe itchiness.
How to Use African Black Soap When You Have Eczema
If you're trying black soap for the first time with eczema-prone skin, a gentle approach works best:
- Start slowly. Use it every other day rather than daily while your skin adjusts.
- Don't leave it on. Unlike some skincare ingredients, soap is a rinse-off product — apply, lather gently, rinse thoroughly. Though it can be used as a pre-treatment, don't do this until after a few weeks of use.
- Moisturise immediately after. Apply your body butter or moisturiser within a minute or two of patting dry, while your skin is still slightly damp. This is when your skin barrier is most receptive and will help lock-in mositure.
- Avoid very hot water. Hot water removes natural oils from the skin. Lukewarm is always better for eczema-prone skin.
- Watch for signs of reaction. If you notice increased redness, stinging or itching after using any new product, stop use and give your skin a few days to settle.
The Bottom Line
African black soap is not a cure for eczema. Nothing topical is. But it is a genuinely thoughtful alternative to conventional body washes for people with sensitive, eczema-prone skin — particularly when you choose a well-formulated version over raw soap straight from the block.
Its roots in West African skincare traditions isn't just cultural interest — it reflects generations of practical wisdom about caring for skin with simple, effective, plant-derived ingredients. At Rukai, that tradition is the foundation of everything we make.
If you're ready to try it, our Ose Dudu Black Soap Body Wash is formulated specifically with eczema-prone and sensitive skin in mind — fragrance-free, sulphate-free, and made to use every day.
→ Shop Ose Dudu African Black Soap Body Wash → Try the Eczema & Psoriasis Duo set (Ose Dudu + Sheaayo Shea Butter)
This article is for informational purposes only and does not constitute medical advice. If your eczema is severe or worsening, please consult a qualified dermatologist or healthcare professional.
