Hi Im Having A Red Dry Bumps On My Pantie

Hi im having a red dry bumps on my pantie line. It started a month ago. It only hurts when I were tight panties or shorts. I put nenospora on it and that helped but it jist came back a couple days ago. Im only 20 years old and as healthy as they come im 5,3 and 130 pounds I am on birth control also. Just the pill.