Hi, My Name Is Alex And I Had Mrsa When

Hi, my name is Alex and I had Mrsa when I was a younger. When I was around 9 I was camping and I had bumps on my thighs. Well my aunt popped the bumps thinking it was pimples. My mom says to this day that I got Mrsa from this. After this I would get worried thinking things like little dots on my penis was Mrsa. However my doctors only said this is hair growing in. But a few days ago a huge bump formed on the shaft of my penis. I think this is Mrsa coming back again. I have a few questions. First, the most important question I need to know, is Mrsa curable? Second, is Mrsa an STD and can it be passed that way? And third, how can I prevent Mrsa? Please message me as soon as possible. Thank you.