Rash in skin folds (intertrigo)

What it is

Inflammation where skin rubs against skin.

How it works

Moisture and friction break down skin; yeast can grow.

Why it matters on darker skin

May look dark brown.

Causes and triggers

Heat, sweat, obesity, diabetes.

What helps — and why it works

Dry well, cotton fabrics: reduces moisture. Expected timeline: days. Antifungal cream if yeast: treats infection. Expected timeline: 1–2 weeks.

More detail

Intertrigo is common under the breasts, in the groin, between the buttocks, under a belly fold and in the necks of chubby babies. Skin rubbing on skin traps heat and sweat, softening the outer layer until it breaks down, and the warm, moist area then encourages Candida yeast or bacteria. On darker skin it may look dark brown, grey or purple rather than red, often with a moist, shiny surface, and yeast infections typically have small separate spots just beyond the main edge. Keeping folds clean and completely dry is the foundation: dry gently with a soft towel or a cool hair-dryer setting, and consider placing a clean cotton cloth in the fold. Well-fitting cotton bras and underwear help. A plain barrier cream can protect skin, and an antifungal cream treats yeast. Recurrent intertrigo is worth discussing with a doctor, particularly if you might have diabetes, which makes it more common.

What to avoid and why

Avoid steroid mixtures.

Common mistakes

• Using powders that clump.

Body care basics in a hot climate

Heat and humidity mean the body sweats more, which feeds the bacteria and yeasts that cause odour, rashes and some types of body acne. A daily lukewarm shower with a gentle, soap-free or mild cleanser, thorough drying of skin folds and between toes, and fresh, breathable cotton clothing prevent many problems. Moisturise straight after bathing while skin is still damp so water is sealed in; this matters even in humid months because frequent washing strips natural oils, and it matters most during harmattan. Avoid sharing towels, razors and sponges, which spread fungal and bacterial infections. When shaving, use a sharp blade, shave with the grain and do not stretch the skin; for curly hair a guarded trimmer is often better. Be cautious with body-lightening, 'carrot' or 'toning' lotions: many contain undeclared steroids or mercury. If a rash spreads, keeps coming back, or appears with fever, see a doctor rather than trying more creams.

Choosing body products

For most people an unscented, gentle cleanser and a plain moisturiser are enough. Antiperspirants containing aluminium salts are the most effective way to reduce sweating and are best applied at night to dry skin. Fragranced body sprays and deodorants are a common cause of allergy; fragrance-free options are kinder to sensitive skin. Aerosol products are easy to over-apply and some have been recalled for benzene contamination, so roll-ons and creams are a sensible default. For fungal rashes, plain antifungal creams such as clotrimazole are better than combination creams containing strong steroids, which can make infections spread. Always check for a NAFDAC number and a full ingredient list.

Questions to ask your doctor or pharmacist

Useful questions include: What do you think is causing this? Is it likely to come back, and how can I prevent it? Which products should I stop? How long before I should expect improvement, and when should I come back if it isn't better? Are there side effects to watch for? Is this treatment safe if I am pregnant, breastfeeding or for my child? Writing your questions down, bringing your products (or photos of their labels) and taking dated photos of the problem make an appointment much more useful.