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Diaper rash is a common form of skin inflammation (dermatitis) that appears as a patchwork of bright red skin on a baby’s buttocks, thighs and genitals. Most babies will develop diaper rash at some point.

Diaper rash usually causes mild redness and scaling on the skin that is covered by the diaper. In more severe cases, it may lead to pimples and the skin may break and ooze. Diaper rash can occur with both cloth and disposable diapers.

Children under the age of 2 are most likely to develop diaper rash, with the highest level of incidence occurring between the ages of 9 months and 12 months, when the child is able to sit up more often but may not yet be walking. A family history of allergic rhinitis (hay fever), asthma, eczema or allergies may predispose a baby to developing diaper rash. 

Adults with urinary or fecal incontinence (inability to control urination or defecation, respectively) who use adult diaper products may also develop diaper rash. It can also occur in adults who are unable to routinely wash the genital area, such as during a long hiking trip. Treatment of diaper rash is the same for children and adults.