I'm 15 and I was taking a shower and I was looking around and noticed a bump on my penis its about a half a centimeter wide and its dome shaped if I grab the loose skin around it I can feel that it is only attached to the layer of loose skin on my penis it is on the underside of it about half way down in the middle its only slightly red and doesn't hurt unless I pinch it in the right spot help I am really worried its been there for about a week or two now

It may be nothing, it may be genital warts or another std if you are sexually active. I would go to the dr.