Underarm and crotch pimples are mostly caused by skin eczema, and a few are caused by folliculitis and ringworm. 1. Skin eczema: armpits and crotch are not easy to breathe, hot weather, humid environment, body immune disorders, can lead to inflammatory skin lesions, such as eczema, manifestation of red pimples. Attention should be paid to skin cleanliness and a light diet. You can use antihistamines under the guidance of a physician to clear away heat and dampness and relieve itching. Such as loratadine, compound glycyrrhizin capsules, bitter ginseng tablets and so on. Topical hormone ointment can effectively relieve itching, such as mometasone furoate, dinaid, etc.. 2. Folliculitis: easy to sweat, humid parts easily caused by folliculitis, manifested as follicular papules, the more serious is a grain pustules. Pay attention to cleanliness and hygiene, avoid scratching and squeezing. Local treatment to stop itching, sterilization-based, can be coated with mupirocin ointment, 10% to 20% ichthyol ointment, 2% tincture of iodine, etc., serious folliculitis can be used as appropriate antibiotics. 3. ringworm: because the armpits, crotch area special, easy to harbor fungal infections, will also appear in the part of the pimples of the situation, this time you need to give antifungal treatment such as topical ketoconazole, miconazole, etc., oral itraconazole capsules, if necessary. There may be other reasons for these parts of the pimples, it is recommended to go to the hospital in time, to clarify the cause of the disease, symptomatic treatment, drugs need to be used in accordance with the doctor’s instructions.