Why acne and pimples are common in adolescents?

Acne - a condition that occurs when hair follicles plug with oil and dead skin cells. During puberty, in males and females acne is cause by an increase in hormone testosterone.

In adolescence, secretions of sweat and sebaceous gland are very active. Pimples and acne is caused due to the increased activity of sweat and sebaceous glands in the skin. The hair follicles contain the sebaceous gland which produce sebum(oil). Sebum lubricates our hair and skin. But with puberty sebaceous gland start producing extra sebum due to which pores become clogged with sebum and cause pimple and acne. Extra secretions of sweat and sebaceous gland sometimes result in the bad odour from the bodies.