ADVERSE REACTIONS: A single case (approximately one percent of patients studied) of acneiform eruption occured with the use of combined nystatin and triamcinolone acetonide in clinical studies. Nystatin is virtually nontoxic and nonsensitizing and is well tolerated by all age groups, even during prolonged use. Rarely, irritation may occur. The following local adverse reactions are reported infrequently with topical corticosteroids. These reactions are listed in the approximate decreasing order of occurrence: burning, itching, irritation, dryness, folliculitis, hypertrichosis, acneiform eruptions, hypopigmentation, perioral dermatitis, allergic contact dermatitis, maceration of the skin, perioral secondary infection, skin atrophy, striae and miliaria.