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Acne can occur when there is a build-up of excessive oil in the skin which causes the follicle to become blocked and inflamed. Acne severity can range from mild to moderate and severe and tends to present predominantly on the face, but can also appear on the back, shoulders and chest.
There are many factors that can cause or contribute to acne including hormones, medications, excessive sun exposure and pregnancy. Genetic factors also play a big part and other lifestyle factors such as excessive stress and anxiety and diet may also have an impact.