sentence: Most people get acne during puberty.
sentences_before: The hormones also cause sebaceous glands in the skin to make more sebum, a type of oil that keeps the skin from getting too dry. This causes a skin problem called acne.
sentences_after: When a person has acne, he gets swellings on his skin called blackheads, whiteheads and pimples. Blackheads and whiteheads are painless, but pimples can be red and painful. They usually form on the face but can also appear on the neck, shoulders, upper back and chest. This can cause dandruff, in which small white bits of skin fall from the scalp. Byers, 'Frequently Asked Questions about Puberty', pp.
concept_name: people
headings: Puberty Body changes in males Body hair and skin changes
categories: Physiology Human sexuality