There are more reasons for a red bump on the labia minora, which may be caused by vulvar folliculitis, vulvar eczema, etc., or may be caused by sexually transmitted diseases such as condyloma acuminatum and viral herpes. 1. Vulvar folliculitis: Inflammation of the hair follicles caused by excessive friction of the local skin due to wearing tight underwear or pants, which may be accompanied by itching, pain, redness, swelling and other symptoms. 2. Vulvar eczema: mostly caused by allergies, bacterial infections or low immunity, it can be seen as red pimples on the vulva, accompanied by itching and burning pain. 3. Condyloma acuminatum: caused by human papillomavirus (HPV) infection, manifested as wart-like growths on the labia majora and minora, vaginal opening, and inside the vagina. 4. Viral herpes: genital herpes caused by herpes simplex, which is blister-like, accompanied by itching, pain and burning sensation. Red bumps on the labia minora have more causes, it is recommended to go to the hospital for relevant examinations, under the guidance of a professional doctor to clarify the cause of the disease, targeted treatment, so as not to delay the condition.