I noticed some brown spotting after sex about a month ago, then it went away. Then I bled after sex (fresh) twice last week. I have a small rough patch of skin right at the deepest part of my vaginal wall. I noticed it about 1 year ago its not changed. I thought it might be related to childbirth (scar tissue). Now I am concerned it might be something sinister. I have had every test for infection (negative).