Itchy armpits may be caused by prickly heat, eczema, folliculitis, etc., and should be treated with targeted medication according to the cause. 1. Prickly heat: because of sweaty armpits, prickly heat is easy to appear, you can use prickly heat powder, glycerine lotion, etc. to relieve, usually pay attention to keep the armpit skin dry, change clothes and so on. 2. Eczema: Eczema underarms will appear itchy skin, accompanied by erythema, papules and other manifestations, you can use glucocorticoid ointment such as hydrocortisone cream, tretinoin cream and other treatments. 3. Folliculitis: Itchy underarm folliculitis can be treated with antibiotics such as mupirocin ointment. If the symptoms are more serious, you can also take oral isotretinoin soft capsule treatment. Itchy armpits may also have other causes, it is recommended to go to the hospital in time, to clarify the cause of the disease, in accordance with the doctor’s instructions standardized treatment.