Do you want to know how to get rid of pimples overnight? A pimple is also known as pustules or papule, spots or zits. Pimples that occurs when sebaceous glands (oil glands) which are contaminated with microbes and swell up. The sebum helps to maintain the oil balance of the skin and makes it look healthy and the excess sebum secretion by the oil glands is the main cause of this problem. Pimples or acne generally occurs on the face, neck, shoulders, and back.