Inflammatory disease of the pilosebaceous follicle that usually involves facial and/or central areas of the trunk. It is produced by a combination of bacterial, hormonal and inflammatory factors that compromise sebaceous secretion and epidermal regeneration at the exit of the follicle (also known as "pores" of the skin). Therefore, its expression can be very varied between open and closed comedones (the common blackheads or skin-colored pimples), pustules ("white pimples"), or the formation of cysts and very inflamed and painful lesions. Its treatment will depend on all these factors, which is why it usually requires a combination of topical and often oral treatments. Adequate and early treatment will prevent the formation of unaesthetic scars, which are the most difficult sequelae to resolve.