Patches on my Penis Shaft

[sammyj1]

Hi im new here so any help will be good ! Thx

I developed these a year ago possibly ( i thought it was just from shaving , but they are still there ) there are 3 in a row

Sometimes itchy but not often, only 1 sexual partner in the last 20 years so doubtful to be an STD

just a bit worried about what they are ?

any help appreciated