What should you know about nappy allergy rash?

A reaction may cause itchy, red or swollen skin where the nappy, elastic, wipes, detergent or cream touches. It can extend beyond the most moist area and may appear after a product has been used several times. Irritant dermatitis from moisture and rubbing is more common than a true allergy, and the two can coexist.

The pattern does not identify the cause by itself. A clinician may consider [Contact Dermatitis](/conditions/contact-dermatitis/), [Atopic Dermatitis](/conditions/atopic-dermatitis/), heat rash, intertrigo, psoriasis, ringworm, scabies or a drug rash when examining the skin.

Stop recently introduced wipes, creams, detergents or nappies and use lukewarm water with gentle patting. Change wet or soiled nappies promptly, avoid scrubbing, and allow the skin to dry before applying a plain protective barrier. Keep a note of products and the timing of each flare.

Do not apply leftover steroid, antibiotic or antifungal medicine without advice, particularly on a baby's delicate skin. If the reaction followed a specific product, keep its label so a clinician can review the ingredients and help plan future avoidance.

Seek medical advice for a rash that is painful, raw, weeping, blistered, spreading or failing to improve after the suspected trigger is removed. Urgent care is needed for breathing difficulty, facial or lip swelling, widespread hives, fever with marked illness or rapidly worsening skin.

Ask whether the distribution suggests allergy or irritation, which ingredients should be avoided, and whether testing or treatment is appropriate. Share photographs from the first day and a list of every product touching the area.