I used to would only masturbate with spit when I was a younger teenager and I had 0 issues with it, however it seems like randomly one day I noticed it was raw and aggravated, it hurt to masturbate anymore, many years later here I am with the same issue. I am wondering if it just rubbed all the protective skin off or do I have some STD, I really have no idea, even when I had abstained 120 days once it was still like that, not as painful but still raw.
You can only get an STD from another person or needles. I guess it's like washing your hands multiple times a day it takes time for the skin to heal. I'm not a doctor though.
I used to have a similar problem but I went to the emergency clinic. Mine went away when I changed how I masturbated. I'm now 4 years porn free an I'm tacking a master class on How to overcome porn addiction.