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Acne is an inflammatory skin condition of sebum glands and hair follicles that causes characteristic comedones, papules or pus-filled lesions on skin. Usually it appears on the face, chest and back because there are more sebum glands in these areas. Acne is most common among the young, at least half of the boys and girls aged 14 to 19 have more or less noticeable acne.

Acne can have many causes: excess sebum secretion due to excessive androgen levels or higher sensitivity of sebum glands to androgens, clogging of the sebum gland canal due to its excessive hardening, change in sebum contents or skin colonization with acid-tolerant anaerobic bacterium Propionibacterium acnes.

Acne is diagnosed clinically. Additional tests are needed to rule out illnesses that cause hormonal imbalances. Bacteriological tests can be necessary to determine an effective treatment.

Acne treatment depends on its severity: mild acne is treated with topical medication (gel, cream, skin solution), moderate and severe acne treatment is systemic (medication swallowed). In addition, it is recommended to use anti-inflammatory photodynamic therapy. The success of the treatment depends also on daily skin care, i.e. cleansing with suitable products, choosing right cosmetics, etc.