I have been on Cefalexin for 2 days, yesterday red spots (all in a line) appeared on both sides of my Labia Majora , they were not painful. I visited my doctor today who said it was shaving rash , However, they have become painful tonight when touched. They are not changing in size, colour etc and it does not hurt to urinate. They are just inside the labia. Could the anti biotics be causing this, or do I need to revisit the doctor?