Red bumps on penis shaft and head. Anyone know what these are?

These bumps formed around 2 months ago and have not gone away. On my head, there are two bumps. On my shaft, there are 4, with one being much bigger than the others. Everytime I masturbate, they seem to become a little irratiated. They are painless. I have no clue what they could be. If anyone thinks they know what these are, please reply.

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Were you sexually active immediately before these showed up … ?

no, the last time i had sex was mid-janurary. Noticed the bumps around the end of March.

What are you applying to your penis on a regular basis: any lubes, skin creams and suchlike for masturbation or to hydrate your skin? What age are you?
If you are not currently sexually active what you have is simply irritation to your skin. In terms of what you have on the shaft of your penis these are most likely Fordyce Spots that have developed naturally, and you may have scratched the top off 1 or 2 of them