I Noticed These Bumps/rash (not Itchy) That Appeared On My

I noticed these bumps/rash (not itchy) that appeared on my penis head. My penis head feels sensitive with minor pain I can manage. Can this pain/rash be from masturbating? Fungal infection? Irritation from masturbation?I'm just wondering what these bumps may be, as I fear they may be herpes or worse. Hopefully you can set my mind at ease, but I would like to know your thoughts. I'm going to go for an STD check regardless, I'd still like to know your opinion.