Diaper dermatitis !
A red rash in the diaper area caused mainly by moisture, urine and stool on the skin; yeast often joins in. Frequent changes and barrier creams prevent it.
Updated 2026-11-01
Structures involved
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Why it happens
What it is
An inflammatory rash of the skin covered by a diaper (nappy). The commonest form is irritant contact dermatitis from prolonged contact with urine and stool; secondary Candida infection is frequent. The same mechanism in incontinent adults is called incontinence-associated dermatitis.
Who gets it
One of the most common skin problems of infancy, peaking between about 6 and 12 months. It also affects older adults and bedridden or incontinent patients in hospitals and nursing homes, where it is a nursing-quality indicator.
Causes
- Prolonged contact with urine and faeces under an occlusive diaper
- Faecal enzymes (proteases, lipases) activated by the higher pH that ammonia from urine produces
- Friction and overhydration of the skin
- Secondary infection by Candida albicans, less often by bacteria (S. aureus, streptococci)
Risk factors
- Infrequent diaper changes and overnight wear
- Diarrhoea, including during antibiotic courses
- Recent antibiotic use (favours Candida)
- Introduction of new foods
- Urinary and faecal incontinence in adults, immobility
- Fragranced wipes or soaps that irritate the skin
Pathophysiology
Occlusion keeps the stratum corneum wet, making it fragile and more permeable. Bacterial urease turns urea into ammonia, raising skin pH, which activates faecal proteases and lipases that digest the skin barrier. Friction then erodes the weakened skin. A damaged, warm and moist surface is easily colonised by Candida, turning a simple irritant rash into a candidal one after about three days.
Classification
- Irritant contact diaper dermatitis (most common)
- Candidal diaper dermatitis
- Other causes in the diaper area: seborrhoeic dermatitis, psoriasis, allergic contact dermatitis, bullous impetigo
- Rare but important: zinc deficiency (acrodermatitis enteropathica), Langerhans cell histiocytosis
- Incontinence-associated dermatitis in adults
Symptoms and signs
- Red, shiny patches on the convex surfaces in contact with the diaper (buttocks, thighs, lower abdomen, genitals), sparing the creases in the irritant form
- Bright red rash that involves the skin folds with satellite papules and pustules in the candidal form
- Discomfort, crying or fussiness during diaper changes and urination
- Erosions or shallow ulcers in severe cases
- In adults: redness, burning and skin breakdown in the perineum and buttocks
Diagnosis
- Clinical
- Clinical. The pattern points to the cause: sparing of skin folds suggests irritant dermatitis; involvement of the folds with satellite lesions suggests Candida.
- Tests
- Usually none. KOH preparation if Candida is uncertain; bacterial culture if pustules or crusts are present. Zinc level or skin biopsy for atypical, persistent cases.
- Imaging
- Not needed.
Differential diagnosis
- Candidal diaper dermatitis
- Seborrhoeic dermatitis (greasy scale, also scalp and folds)
- Psoriasis (sharply defined, persistent)
- Allergic contact dermatitis (to fragrances or diaper dyes)
- Bullous impetigo
- Acrodermatitis enteropathica (zinc deficiency)
Goal of treatment
Restore the skin barrier by keeping the area clean, dry and protected, and treat any secondary yeast or bacterial infection.
Treatment
- Conservative
- Change diapers often and as soon as they are wet or soiled; use highly absorbent diapers; allow diaper-free time; clean gently with water or mild cleansers and pat dry.
- Conservative
- Apply a thick barrier cream or paste (zinc oxide or petrolatum) at every change, without rubbing off all of the previous layer.
- Medical
- Candidal dermatitis: topical antifungal (nystatin or an azole) under the barrier cream; a low-potency topical corticosteroid only briefly for marked inflammation. Bacterial infection: topical or oral antibiotics.
- Follow-up
- In incontinent adults: structured skin-care routine, prompt cleaning after each episode, skin-protectant products, and regular skin assessment to prevent pressure injury.
Complications
- Secondary candidal or bacterial infection
- Erosions and ulceration
- Granuloma gluteale infantum (rare, linked to potent steroid use)
- Steroid side effects from high-potency creams under occlusion
- Pressure injury in immobile adults
Prognosis
Most cases clear within a few days with frequent changes and barrier creams. Recurrence is common while diapers are used.
Prevention
- Frequent diaper changes and absorbent diapers
- Barrier cream at each change in at-risk infants or adults
- Avoid fragranced wipes and harsh soaps
- Timed toileting and continence care in adults
Test yourself
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Which pattern distinguishes irritant diaper dermatitis from candidal diaper dermatitis?
Irritant dermatitis spares the skin creases; candidal dermatitis involves the folds and has satellite lesions.
What is the cornerstone of treatment and prevention?
Frequent changes to keep the area dry, plus a thick barrier cream such as zinc oxide or petrolatum.
Why should potent topical corticosteroids be avoided in the diaper area?
Occlusion increases absorption and the risk of atrophy, systemic effects and granuloma gluteale infantum.
Which nutritional deficiency should be considered in a persistent perineal and perioral rash with diarrhoea?
Zinc deficiency (acrodermatitis enteropathica).
Related conditions
- Cutaneous and mucocutaneous candidiasis
- Incontinence-associated dermatitis
- Seborrheic dermatitis
- Contact dermatitis (irritant and allergic)
- Psoriasis
- Impetigo
- Atopic dermatitis
Educational information, not medical advice. For any symptom, see a health professional.
Sources: Diaper rash (MedlinePlus, US National Library of Medicine, 2026).
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