What are contributing factors of acne vulgaris?

• Acnegenic mineral oils, rarely dioxin, • Drugs: Lithium, hydantoin, isoniazid, glucocorticoids, oral contraceptives, iodides, bromides and androgens, and danazol • Others Emotional stress can cause exacerbations • Occlusion and pressure on the skin, such as leaning the face on the hands, is a very important and often unrecognized exacerbating factor (acne mechanica) • Cow’s milk may be associated with acne