dermatologic disorders
Acne Vulgaris
Etiology of Acne Vulgaris
Themost commontrigger is Puberty During puberty, surges in androgens stimulate sebum production and hyperproliferation of keratinocytes. Other triggers include Hormonal changes that occur with pregnancy or the menstrual cycle Occlusive cosmetics, cleansers, lotions, and clothing High humidity and sweating Associations between acne exacerbations and inadequate face washing, masturbation, and sex are unfounded. Some studies suggest a possible association with milk products and high-glycemic diets. Acne may abate in summer months because of sunlight’s anti-inflammatory effects. Proposed associations between acne and hyperinsulinism require further investigation. Some drugs (eg, corticosteroids,lithium,phenytoin,isoniazid) worsen acne or cause acneiform eruptions. 