Buttocks summer pimples and very itchy can be caused by ringworm, eczema, folliculitis and other factors. 1. Ringworm: In summer, the weather is hot, the buttocks are humid and closed, easy to trigger fungal infection, ringworm can penetrate the skin stratum corneum, triggering local inflammatory reaction and secretion of inflammatory substances, can appear buttocks pimples and itchy situation. 2. Eczema: due to hormonal changes, immune abnormalities, alcohol consumption, poor dietary habits and other factors, eczema can occur, summer buttocks increased sweating, localized moisture can be triggered by eczema, localized erythema, papules, papules and other manifestations, accompanied by itchy skin symptoms. 3. Folliculitis: folliculitis is mainly due to infection with bacteria and other pathogens, summer buttocks sweat, can lead to damage to the hair follicles, easy to trigger folliculitis, can appear to the hair follicle as the center of the red pimples or herpes, which can be accompanied by itching and pain. Buttocks summer pimples should be timely medical treatment, under the guidance of specialists to actively carry out appropriate treatment, help early relief of uncomfortable symptoms.