I've got red blotches on my penis and small spots near "the string," which I tore couple years ago. What you think it could be?
I don't know what part of the penis you are referring to as "the string." Since I can't see the spots and your description is vague, I can't say what it is. The only reliable way to find out is to see your physician. If you would like for me to give you some ideas about the possibilities, you will have to send me more details. For example, what size is "small?" Does it hurt or itch?" Do the spots change?
If it itches, the most likely cause is jock itch (called "tinea" by doctors). It could also be acne. Yes, you can get pimples down there. Or an infected hair follicle. Or bites from crabs (lice). The list of possibilities is almost endless.