see a dermatologist. it may be a type of fungus. I had that all over my thighs, ass, and forearms for months. I thought it was ringworm so I did all OTC and herbal ****. finally went to a doc and he said it was something different. he prescribed me some topical steroid cream and it disappeared in a week. my nine month old boy even had a dot like that and the pediatrician prescribed the same thing. apparently it's in everyone's bodies already, some just randomly become active
OR you could have something completely different!!! have unprotected sex with any hookers?