<prompt> Which hormone is responsible for acne ?EstrogenThyroidTestosteroneGonadotropins  <response>: Ans. is c i.e., Testosterone Predisposing factors for Acne vulgaris Genetic factors Hormones -4 Androgens, glucocoicoids. Psychological stress and depression. Environmental factors High temperature humidity. Cosmetics -3 Containing lenolin, petroleum, vegetable oils. Infection -- Propionibacterium, Pityrosporum, Staph. epidermidis. Menstural cycle -4 Premenstural aggravation. Hyperkeratosis of pilosebaceous ostia. Drugs Antepileptics Carbamazepine, phenytoin, phenobarbitone, antitubercular INH, rifampin, ethionamide, antidepressants, cyclosporine, Vitamin B12.Cough syrups containing halogens Iodides, bromides. 