you have asked a question i don't think anyone will be able to answer correctly. we can't see what is on your thigh. if you are worried go see a doctor. if there hasn't been a change in the area for almost 8 years it is probably and i say this with emphasis probably something similar to scars from ingrown hairs. it doesn't sound dangerous to me but again if you are worried have a doctor look at the area. just for your peace of mind.