Red pimples on the body may be caused by acne, urticaria, folliculitis and so on. 1. Acne: commonly known as pimples, is a common chronic inflammatory follicular sebaceous gland disease, which is mainly manifested in the face, neck, shoulders, chest and back lesions, can be pimples, inflammatory papules, pustules and so on. It can lead to red pimples on the body. 2. Urticaria: It is a limited edema reaction due to the temporary dilation of small blood vessels and increased permeability of the skin and mucous membranes. Usually manifested as the appearance of the surface of the skin of varying sizes of red masses or erythema, mostly accompanied by itching and other symptoms. It can also lead to red pimples on the body. 3. Folliculitis: bacterial or fungal infection of the hair follicles caused by inflammation, its main manifestation is the hair follicles appear red papules, higher than the skin surface, a few days after the rash in the center of the pustules, surrounded by redness and swelling, but also accompanied by pain, itching, fever and other symptoms. Its can also cause red pimples on the body. There are many other causes of red pimples on the body, which should be taken seriously, and timely consultation should be made to identify the cause of the disease and follow the medical advice for further treatment or therapy.