The following are the causes of red bumps on the vulva: 1. Local allergies are caused by red papules, accompanied by local itching, often with a history of vulva cleaning with drugs, or allergies caused by the local plugging of certain drugs in the vagina, or new underwear bought without washing and worn on the body, which can easily cause local allergies, this situation is recommended to actively anti-allergy treatment. If necessary, take oral antibiotics.