Acne on the contours of the face is most commonly known as pimples or acne. Acne occurs during puberty, and acne that occurs in young and middle-aged adults is called post-pubertal acne. Acne is associated with an exuberant secretion of androgens. People with oily skin are more susceptible to the disease. When hormones are secreted and sebum production is high, Propionibacterium acnes multiplies, leading to inflammation of the follicular sebaceous glands causing acne. Acne occurs on the face, chest and back, and the location of acne varies from person to person, with some people having acne on the forehead, some on the jaw, and some on the cheeks. Acne appears as pimples in the early stages of the disease, and as inflammation develops, it will gradually evolve into inflammatory pimples, cysts, and nodules, which are related to the high secretion of the sebaceous glands. Acne can also be triggered or aggravated by a spicy, stimulating diet or frequent late nights and mental stress. Acne on the contour of the face may be caused by the exuberant secretion of sebaceous glands, or it may be caused by improper diet or prolonged mental stress.