Red dots on the body slowly become pimples painless and itchy consider folliculitis, insect bite dermatitis, allergic purpura, etc., to the specific cause of the choice of topical antibiotic ointment, glucocorticoid ointment and other treatments. 1. Folliculitis: Folliculitis is a purulent inflammation confined to the mouth of the hair follicle, the lesion starts as a red follicular papule, which can gradually become bigger and bigger, and pustules can appear in the center of some of them. You can apply mupirocin cream, erythromycin ointment and other topical antibiotics as prescribed by the doctor. 2. Insect bite dermatitis: After being bitten by insects, a small number of people will not show obvious symptoms, starting with red spots and later turning into pimples. You can apply glucocorticoid cream, such as dexamethasone cream, mometasone furoate cream and so on, as prescribed by the doctor. 3. Anaphylactic purpura: This is a disease of inflammatory reaction of blood vessels and perivascular tissues, and the cause of the disease should be actively sought and removed. The disease is self-limiting, and adequate fluids should be given to facilitate the excretion of allergens, and rest and topical glucocorticosteroids can be used. In severe cases, glucocorticosteroids should be used systematically. Red spots on the body slowly become pimples painless and itchy should go to the hospital in a timely manner, to clarify the cause of the symptomatic treatment, the above drugs should be used in accordance with the doctor’s instructions.