Symptoms

The most common form of acne is known as "acne vulgaris", meaning "common acne." Many teenagers get this type of acne. Excessive secretion of oils from the sebaceous glands accompanies the plugging of the pores with naturally occurring dead skin cells (corneocytes) blocking hair follicles. The accumulation of these corneocytes in the duct appears to be due to a failure of the normal keratinization process in the skin which usually leads to shedding of skin cells lining the pores. Oil secretions are said to build up beneath the blocked pore, providing a perfect environment for the skin bacteria Propionibacterium acnes and the lipophilic (oil/lipid-loving) yeast Malassezia[citation needed] to multiply uncontrollably. Under the microscope, however, there is no evidence of pooled trapped sebum.[original research?] Indeed the oil percolates through the plugged duct onto the surface. In response to the bacterial and yeast populations, the skin inflames, producing the visible lesion. The face, chest, back, shoulders and upper arms are especially affected. The typical acne lesions are: comedones, papules, pustules, nodules and inflammatory cysts known as cystic acne, one of the more severe forms. These are more inflamed and pus-filled or reddish bumps, that can easily lead to scarring or serious infections. Non-inflamed 'sebaceous cysts', more properly called epidermoid cysts, occur either in association with acne or alone but are not a constant feature. After resolution of acne lesions, prominent unsightly scars may remain.
Aside from scarring, its main effects are psychological, such as reduced self-esteem[2] and, according to at least one study, depression or suicide.[3] Acne usually appears during adolescence, when people already tend to be most socially insecure. Early and aggressive treatment is therefore advocated to lessen the overall impact to individuals.[2]