Alcohol and marijuana cause Vitamin B deficiency
and result in small bumps in the mouth. Vitamin B supplements will help you. You can also use a soothing anesthetic
cream for pain relief. STD's generally present with symptoms like discharge/rash/ulcer/swollen glands in the genital and inguinal region. Also they occur due to unprotected contact. If you don't have history of unprotected contact then don't worry about STD. Wish you good health.