Diaper Rash (Diaper Dermatitis)

How diaper rash develops

Healthy skin has a protective outer layer. Under a diaper, several factors break it down:

1. Wetness: prolonged contact with urine softens (macerates) the skin and makes it more fragile.
2. Rising pH: bacteria in stool convert urea in urine to ammonia, making the skin more alkaline.
3. Stool enzymes: at a higher pH, digestive enzymes in stool (proteases and lipases) become more active and digest the skin surface. This is why diarrhea causes such sore rashes.
4. Friction: rubbing from the diaper damages weakened skin.
5. Infection: once the barrier is broken, Candida albicans yeast from the gut colonizes the skin, often after about 3 days.

Modern superabsorbent disposable diapers have reduced the frequency and severity of diaper rash compared with older cloth diapers, but any diaper left on too long can cause it.

Types of diaper dermatitis

Irritant diaper dermatitis

The commonest type. Red, sometimes shiny patches on convex surfaces that touch the diaper: buttocks, genitals, lower belly and upper thighs. Skin folds are spared because they do not touch the diaper. Severe cases can erode into shallow sores.

Candida diaper dermatitis

Yeast infection gives a beefy red, well-defined rash that involves the skin folds, with "satellite" papules and pustules beyond the edge. It is more likely after antibiotics or a rash lasting longer than 3 days, and may accompany oral thrush.

Other conditions in the diaper area

• Seborrheic dermatitis: salmon-pink, greasy, sharply defined patches in the folds, usually with cradle cap.
• Allergic contact dermatitis: to fragrances or preservatives in wipes and creams, or to diaper dyes and rubber. Follows the outline of the product.
• Bacterial infection: impetigo with blisters and crusts, or perianal strep.
• Psoriasis: bright red, sharply outlined plaques that resist usual treatment.
• Rare causes: zinc deficiency (rash around the mouth and diaper area with diarrhea, in premature or weaning infants), Langerhans cell histiocytosis, and Kawasaki disease.

Diagnosis

A doctor or nurse diagnoses diaper rash by looking at it and asking about diapering habits, products, diarrhea and antibiotics. Swabs are taken only when bacterial infection is suspected. Rashes that do not respond to treatment, or come with failure to thrive, are investigated further, sometimes with a skin biopsy.

Treatment

Barrier creams

Barrier creams are the main treatment. They create a layer that keeps urine and stool off the skin.

Apply generously at every change. Leave a base layer on and clean off only soiled cream, so the skin is not rubbed raw.

Antifungal creams

For yeast, or any rash lasting more than 3 days, clotrimazole, miconazole or nystatin cream is applied at each change, usually for 7 to 14 days and a few days beyond clearing. Ask a pharmacist or doctor before using these in infants.

Mild steroid creams

A doctor may recommend 1% hydrocortisone for a few days for very inflamed skin. Stronger steroids and combination steroid-antifungal creams should be avoided in the diaper area because the occlusion increases absorption and can thin the skin.

Antibiotics

Bacterial infections need antibiotic ointment, or oral antibiotics for widespread infection or strep.

Prevention

• Change diapers as soon as they are wet or soiled, about every 2 to 3 hours for newborns.
• Clean with water or fragrance-free wipes and pat dry.
• Use a barrier cream at changes if your baby is prone to rash.
• Give diaper-free time daily.
• Make sure diapers are not too tight.
• With cloth diapers, rinse thoroughly and avoid fabric softeners.
• During diarrhea or antibiotic courses, change more often and use a thick barrier.

Breastfed babies tend to have less diaper rash, possibly because their stools have a lower pH.

Complications

Complications are uncommon. Severe or neglected rashes can develop secondary bacterial infection or erosions. Rarely, chronic irritation causes a nodular rash called granuloma gluteale infantum, linked to strong steroid use. Adults with incontinence face the same risks, plus pressure sores.

Frequently asked questions

What is the main cause of diaper dermatitis?

Prolonged contact with urine and stool. Wetness softens the skin, ammonia raises the pH, and stool enzymes then irritate and damage the skin surface. Friction from the diaper and yeast overgrowth add to it. Diarrhea and antibiotics make rashes more likely.

What is the best cream for diaper rash?

A thick zinc oxide paste or petroleum jelly at every change works for most irritant rashes. Yeast rashes need an antifungal cream underneath the barrier. Avoid products with fragrance, and do not use strong steroid creams unless a doctor prescribes them.

Can adults get diaper dermatitis?

Yes. Adults who wear incontinence pads or briefs can develop incontinence-associated dermatitis, which works the same way. Prompt changes, gentle pH-balanced cleansers and barrier creams are the main treatments, and yeast is a common complication.

Do cloth or disposable diapers cause more rash?

Modern disposable diapers with superabsorbent gel keep the skin drier and are linked to less diaper rash. Cloth diapers can work well if changed often and washed thoroughly without irritating detergents or softeners.

How can I prevent diaper rash from coming back?

Change diapers promptly, use water or fragrance-free wipes, pat skin dry, allow diaper-free time and apply a barrier cream at changes. Increase these steps during diarrhea, teething and antibiotic courses.