Acne vulgaris, commonly referred to as acne, is a skin condition characterised by whiteheads, blackheads and inflamed red pimples. It is a very common skin condition in adolescents and affects a significant minority of adults. Acne can severely impact an individual’s psychological well-being, as acne can lead to scarring. Although not a systemic disease (i.e. acne is usually confined to the skin and does not affect other tissues or organs), a rare and systemic form of acne, acne fulminans, can affect bones and other tissues.