Whenever I masturbate small red dots (one or two) coming on my penis head. And it went off automatically in two or three days. Those dots are not itchy or painful but it makes me afraid of STD. Coz accidentally I touched call girl vagina with my penis not penetrate only touch. I ate antibiotics from the next day for 3 days by doctors advice. Im afraid whether I am having STD. Need clarification. Took blood test after one week it for HIV and VD it shows negative. What should I do to get rid of that red dot on my penis head. M really stressed about this. Can some one clarify.