Blue patch + red penis skin

Hello,

For three months I had two stains on the shaft on the penis (one on the top, the other in the middle). The stains comes and go and it appears much darker than on the picture. Recently I discovered a red patch at the basis of my penis, the skins looks like burnt or irritated but not dry. Problems on my skin are on the left side of my penis. (I’m left handed, I use my left hand for masturbation), the other side of my penis is ok, the skin is great and healthy.

Blood and STD exams are ok, no diabet or problems…
Could it be linked to masturbation or from an infection ? Has anyone experienced problems on a side of the penis only ? Thanks a lot

honestly bro personally I would not be worried about that. if you get all tests negative then looks like wear and tear from your wang being used . seems unavoidable and it will change over time, we all have signs of wear and tear . if all tests negative and it not causing any pain or anything like that, just ignore it and accept it just comes with territory and get on with enjoying your life bro , it seems 99.99% friction /masturbation related