Acne is a skin condition which has plugged pores (blackheads and whiteheads), inflamed pimples (pustules), and deeper lumps (nodules). 

Acne occurs on the face, as well as the neck, chest, back, shoulders, and upper arms. 

Although most teenagers get some form of acne, adults in their 20's, 30's, 40's, or even older, can develop acne. 

Often, acne clears up after several years, even without treatment. Acne can be disfiguring and upsetting to the patient.

Acne is not caused by dirt.

Testosterone, a hormone which is present in both males and females, increases during adolescence (puberty). It stimulates the sebaceous glands of the skin to enlarge, produce oil, and plug the pores. Whiteheads (closed comedones), blackheads (open comedones), and pimples (pustules) are present in teenage acne.
 
Early acne occurs before the first period and is called prepubertal acne. When acne is severe and forms deep "pus-filled" lumps, it is called cystic acne. This may be more common in males. 

Adult acne develops later in life and may be related to hormones, childbirth, menopause, or stopping the pill. Adult women may be treated at the period and at ovulation when acne is especially severe, or throughout the entire cycle.

Adult acne is not rosacea, a disease in which blackheads and whiteheads do not occur. In later part, you can see how MEBO Acne Cream works on acnes.