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Acne Vulgaris : Acne vulgaris is a self limiting disorder of teenagers and young adults.But 10-20% of adults may continue to experience this disorder. In adolescence, there is increased secretion of sebum from sebaceous glands. The glands get blocked with the retained sebum and kerotinous debris. Small cysts called Comedons are formed due to blockage of hair follicles. Proprionobacterium acnes is the cyst and caused production of fatty acids within the cysts. Thus causing infection of the cyst and bursting of the cyst wall. The extrusion of oily, keratinous debris triggers a foreign body reaction develops. Comedones : These are of two types- Closed comedones = White heads. Opened comedones = Black heads. The closed comedones are mostly associated with inflammatory lesions like papules , cysts and nodules. These are seen as small white heads with the naked eye or sometimes are not visible to the naked eye. The Open comedones are seen as Black heads. These are more st...