Weird bump on right side of shaft. Came two days ago. Red, painful, and if lightly squeezed feel small ball in it size of small pea. About a centimeter. Today sprouted small pus bubble. Popped it, but came back later bigger. No ingrown hair. Not an STD. I'm 12. What is it? (Obviously I need to see a doc, but I want to have some idea before I go.

That could easily be a pimple. Usually when you have a pimple in "strange" places they are more sensitive and when you pop it, it just gets bigger kind of like its swollen. It doesn't necessarily mean there is a hygiene problem, but just keep an eye on it and make sure your clean

Ok thanks