85% of population suffers from pimples, which affect nearly all adolescents and adults at some time in their lives. However, there are other forms of acne. Most people may encounter acne vulgaris, the formation of comedones, the simplest of lesions.

Lesions represent structural change in a bodily part affected by acne. The word “lesion” is often used in a different meaning, not only for the skin disorder. Acne lesions are caused by processes in the sebaceous follicle and usually take the form of comedones (blackheads and whiteheads).

Comedones are called blackheads or whiteheads. It depends on the fact whether the pore is open or not. Blackheads are dark because of the pigment in our skin called melanin. They appear when a mixture of keratin and sebum rises to the surface of the follicle. Whiteheads are small and white raised spots filled with the secretion of the sebaceous gland that swells below the skin surface.

Usually people cannot resist picking and squeezing comendones in home conditions, which usually lead to a slight infection. Different types of bacteria have an easy access to an open pore.

Papules are small, solid elevation of the skin containing no pus. Very often small papules form clusters; this is how our tissue reacts to acne.