Well today I went to shower and observed a red spot on the lower part of my penis head, it's really sensitive when I touch it. Well I'm actually 16 and didn't had sex yet so it can't be STD's or anything similar, can it be from masturbation (I used to masturbate twice daily time of 3-4 days)? Thanks indeed for help.
It could be a zit, pimple, even a bug bite. You can get them anywhere.
It should go away in a few days. Post back if you notice any discharge.