I had lil red bumps on the head of my penis for a month or so then they disappeared, what could it hav been?

Penile "bumps": Tis could be a std (herpes), folliculitis (hair follicle inflammation), skin abrasion or a manifestation of another problem such as a reaction to detergents or cancer. Correct diagnosis requires examination by your medical doctor, dermatologist, or urologist. You should have this evaluated as you may be at risk for spreading infection, or this issue may signal a more worrisome health problem.