Acne Acne is the term for plugged pores, pimples and deeper lumps that occur on the face, neck, chest, back, shoulders and upper arms. Since most people develop acne during adolescence, it is most prevalent in those 16 to 18 years of age. In general, it becomes less of a problem after the age of 25. However, about 15% of women and 5% of men continue to have acne as adults.
