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Acne is most often the cause of bumps that are red and itchy on and around the vagina. Vaginal pimples are like face pimples, or those found elsewhere on the body. Vaginal acne is skin's natural reaction to harsh soap, douches, shaving or not showering enough.
There are many possible causes of vaginal itching without discharge. 1  Allergic reaction or contact dermatitis-Some women may experience an allergic reaction or contact dermatitis in the vaginal area, resulting in a localized rash or irritation.2  This may be caused by contact with a substance like soap. A fungal infection-An infection known called jock itch, a form of ringworm around the vagina, can cause vaginal itching without discharge. 2  The skin develops a rash with areas that may be red, peeling, or bumpy and blister-like.