What should you know about Mustela nappy rash?

Nappy rash is irritation in the covered area, often caused by moisture, friction, contact with urine or stool, or a reaction to a product. Redness may affect the buttocks, folds, or genital skin. A rash that is bright red in the folds, has small spots around its edge, or keeps returning can have a yeast contribution and may need a clinician’s advice rather than barrier care alone.

Change nappies promptly, cleanse with lukewarm water or a fragrance-free cleanser, and pat rather than rub. Allow brief air exposure when practical, then apply a thin protective layer to clean, dry skin according to the product directions. Avoid talc, fragranced wipes, scrubbing, and switching between several new products at once. A clinician can advise whether [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/) or [Topical Antifungal Treatment](/treatments/medical-dermatology/topical-antifungal-therapy/) is appropriate.

Arrange medical advice if the rash is painful, blistered, raw, oozing, crusted, rapidly spreading, or accompanied by fever. Seek prompt assessment for a very young or unwell baby, or when the rash does not start improving with careful nappy care. Do not use steroid or antifungal medicine on an infant unless a healthcare professional has recommended it.

Could this be irritant rash, yeast, or another condition? Which ingredients should we avoid? How often should the barrier product be applied, and when should we return if the skin is not settling?