Acne vulgaris, also known as acne or red spots, is the most common skin disease worldwide. It is a chronic inflammatory disease involving the pilosebaceous unit of the skin, which includes a hair follicle and sebaceous gland. Acne is recognizable as spots or lesions on the skin, including both non-inflammatory (blackheads and whiteheads) and inflammatory lesions (papules, pustules, nodules and cysts).
Although acne can occur on other parts of the body, including the chest, back, shoulders and upper arms, it most commonly affects the face and neck.
Scarring due to acne is very common, and the duration of acne has been shown to correlate with the scarring process, supporting the use of products that reduce the likelihood of acne and prevent new lesions from developing. Depending on the lesion type and the severity of acne, different preventative or treatment methods may be required.