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Acne is often associated with teenagers and the onset of puberty, but in fact acne can strike at any age and adult acne is more common than you may think. It is characterised by comedones, more usually referred to as blackheads and whiteheads, as well as pus-filled pimples or spots, also called pustules. Acne is commonly found on the face, neck, back and chest and varies in severity. As well as affecting self-esteem, with many women, in particular, using heavy make-up to hide spots, it can also go on to cause long-term scarring. Acne is caused by a hormonal imbalance which leads to an overproduction of sebum, the oil found in the sebaceous glands of the skin. Along with the excess oil, dead skin cells start to clog up the pores as they aren’t shed properly and the clogged follicles are the black and whiteheads we see. This build-up of oil is also a perfect environment for a bacteria called Cutibacterium acnes (previously called Propionibacterium acnes or p.acnes) which lives naturally on the skin but proliferates and triggers redness and the spot formation associated with acne. Treatments seek to reduce the presence of excess oil and make the skin an unsuitable environment for the bacteria.