Oval shiny redness
on shaft of penis
I had gone through your history and the the snap you have attached, A single erythematous,non itchy, non painful lesion without any discharge from the penis is most likely is due to mild trauma.This occur following constant friction during the act of masturbation
or any sexual act.
The trauma by the cloths or scratching in sleep can also present with same type of lesion. The skin over the penis is soft and very sensitive with mild trauma it can produce erythematous lesion like what you are having and takes some time to come back to the normal.
STI (sexually transmitted infection) of any kind will have some symptom like pain, itching, burning or discharge.Your lesion doesn't look like any of the STIs.
So your report and history doesn’t seem to be anything significant and you just apply any moisturizer to keep the skin soft.
Hope i have cleared your doubts, if you have any query please feel free to post them.