Irritant or contact diaper dermatitis (DD) presents maximally on areas of skin in consistent contact with the irritant or allergen, ie, the convex areas of the groin but not the folds. This finding is the most useful clue for distinguishing between DD and diaper rash caused by candidal infection which favors the folds.
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Courtesy of Drs. Douglas W. Kress and Robin P. Gehris
