Common acne, or acne vulgaris,occur most frequently in the adolescent years as a result of overactive secretion by the sebaceous glands,with blockage and inflammation of their ducts.
The rate of sebum secretion increases more than fivefold between 10 and 19 years of age.as a result sebaceous gland ducts may become plugged with sloughed skin cells and sebum contaminated with bacteria
The inflamed plug is called a Comedo and is most characteristic sign of acne.
Pus filled pimples or pustules result from secondary infections within or beneath the epidermis,often in a hair follicle or sweet pore
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