Acne vulgaris is probably the most common skin disease, affecting 85 to 100% of the population at a certain point in their lives. (1)
References +

1. Goulden V, Stables GI, Cunliffe WJ. Prevalence of facial acne in adults.

2. J Pawin H, Beylot C, Chivot M, Faure M, Poli F, Revuz J, et al. Physiopathology of acne vulgaris: recent data, new understanding of the treatments. Eur J Dermatol 2004 Jan-Feb ; 14 (1): 4-12. Am Acad Dermatol 1999 Oct; 41 (4): 577-80.

3. Américo Figueiredo e col., Avaliação e tratamento do doente com acne – Parte I: Epidemiologia, etiopatogenia, clínica, classificação, impacto psicossocial, mitos e realidades, diagnóstico diferencial e estudos complementares.

Acne is a disease of the pilosebaceous follicle, which usually develops in adolescence under the hormonal influence of age. (2)

Acne usually affects the psychological state with decreased self-esteem and self-confidence that can lead to problems in one’s social life and even depression. (3)

Acne is characterized by the appearance of non-inflammatory lesions, commonly known as whiteheads and blackheads, which result from obstruction of the hair follicles by fat, cells and bacteria. The inflammatory lesions correspond to acne blemishes, also known as papules, which break out on the skin in the form of painful red bumps, because of hair follicle infection. In the most severe cases of acne, larger lesions such as pustules, nodules or cysts break out, which can lead to permanent scarring. (3)

The most affected areas of the body are the face, neck, chest, back and shoulders due to a higher concentration of sebaceous follicles. (3) The age groups most affected are people between the ages of 10 and 24 years. However, 12% of women and 3% of men continue to experience the disease until the age of 45. (1)