Pimples in the genital area may be a result of infection of the hair follicle due to bacteria. Shaving your pubic hair is one potential cause of folliculitis. As your hair starts growing out of the follicle, it curls back toward the skin, causing irritation.Vaginal pimples are likely caused by contact dermatitis. This is a reaction to something that touches the skin. Contact dermatitis of the genitals may be caused by sensitivity to: bubble baths and soaps, especially if they contain fragrances feminine wipes, deodorants, lotions, powders, or perfumes tampons or sanitary pads douches spermicides, stimulants over-the-counter topical medications laundry detergent and dryer sheets.