Stomach pimples may be an inflammation of hair follicles called folliculitis, as stated by WebMD. Folliculitis may occur on any part of the body, but the condition commonly appears on the stomach after using a hot tub or spa. Stomach pimples may also be standard acne, which can occur anywhere.
Acne is a skin condition that occurs from hair follicles that are blocked by dead skin cells and oil, according to FamilyDoctor.org. Acne occurs on any part of the body but commonly appears on the chest, back, neck and face. Symptoms of acne begin during the early teenage years and may last throughout most of adulthood. Common over-the-counter treatments of acne are benzoyl peroxide and salicylic acid. Doctors may prescribe prescription medication if over-the-counter treatments are ineffective.