Acne (noun)

1. A common skin condition characterized by the appearance of pimples, blackheads and whiteheads, typically on the face, neck, chest and back.
2. A disorder of the sebaceous glands and hair follicles of the skin.

Origin:

From the greek word "akme" meaning "point", "edge" or "peak".

Examples:

1. Many teenagers experience acne during puberty due to hormonal changes.
2. Acne can be treated with over-the-counter creams and gels, as well as prescription medications.
3. Stress can exacerbate acne symptoms.
4. Some people use natural remedies like tea tree oil to treat their acne.
5. Acne can cause scarring if not treated properly.