Quick answer: Nappy rash is almost universal in the first year — and knowing how to treat it correctly means knowing whether you’re dealing with irritant nappy rash or candidal (thrush) nappy rash.
Nappy rash is almost universal in the first year — and knowing how to treat it correctly means knowing whether you’re dealing with irritant nappy rash or candidal (thrush) nappy rash. The treatments are different and using the wrong one won’t help.
Irritant Nappy Rash
The most common type. Caused by prolonged skin contact with urine and faeces, which breaks down the skin barrier and causes irritation. Appearance: Generalised redness across the nappy area — bum cheeks, inner thighs, and perianal area — but typically sparing the skin folds and creases (because urine doesn’t pool there). Skin may look shiny or chapped. In mild cases, just redness; in moderate cases, the skin may be raw-looking. Treatment: Frequent nappy changes (ideally every 2 hours or immediately after soiling), thorough cleaning with plain water or water-based wipes (avoid fragranced wipes on broken skin), thick barrier cream at every change (zinc oxide 15–40% in white soft paraffin — Sudocrem, Bepanthen, Metanium — all effective), and nappy-free time when possible.
Candidal (Thrush) Nappy Rash
Caused by Candida albicans (the same yeast that causes oral thrush). Often follows antibiotic treatment (antibiotics kill protective bacteria, allowing Candida to overgrow) or alongside oral thrush. Appearance: The distinguishing feature is satellite lesions — small, separate red spots or pustules around the edges of the main rash. The rash typically involves the skin folds and creases (where Candida thrives in warm, moist environments). The central rash is often a deeper, more intense red than irritant rash. The skin may have a shiny, varnished appearance. Treatment: Antifungal cream — clotrimazole (Canesten) or nystatin — applied at every nappy change, typically for 7–14 days. Continue barrier cream alongside antifungal. If oral thrush is also present, treat both simultaneously.
Bacterial Nappy Rash
Less common, but important to recognise. Signs of secondary bacterial infection in a nappy rash: increasing redness and warmth beyond the nappy area, yellow or golden crusting, weeping or oozing, and fever. Impetigo (Staphylococcus aureus or Streptococcus) can develop in a disrupted nappy rash. This requires topical antibiotic cream (fusidic acid) or oral antibiotics if spreading — GP assessment is needed.
Prevention
- Change nappies frequently — don’t leave in a wet or soiled nappy
- Clean thoroughly but gently at each change
- Apply barrier cream at every change during prone periods
- Allow nappy-free time daily — even 10–20 minutes makes a difference
- Use water or water-based wipes — avoid alcohol or fragrance on irritated skin
- Avoid plastic pants over cloth nappies — reduces air circulation
Frequently Asked Questions
How do I tell the difference between irritant and thrush nappy rash?
The key clue is satellite lesions — separate spots around the edges of the rash strongly suggest Candida. Also check: does the rash involve the skin folds (thrush does; irritant rash often spares them)? Has baby recently had antibiotics? Is there oral thrush (white patches in the mouth that don’t wipe away)? If unsure, a GP can confirm.
Can I use hydrocortisone on nappy rash?
Mild hydrocortisone can be used short-term for severe inflammatory irritant nappy rash on the GP’s advice, but should not be used routinely. It’s ineffective for Candida (which requires antifungal treatment) and prolonged use in the nappy area can cause skin thinning. Barrier cream and frequent changes are the first-line approach.
My baby’s nappy rash keeps coming back — why?
Recurring nappy rash often indicates undertreated Candida (the antifungal course wasn’t long enough, or it wasn’t applied consistently), diarrhoea (increased stool frequency maintains skin irritation), food sensitivity causing loose stools, or a dairy/food allergy. Persistent or frequently recurring nappy rash warrants a GP discussion.
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