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Raw tender area is likely due to the irritation from masturbation.
Herpes infection is unlikely since there is no blister formation or multiple lesions, or no pain either.
However, this can be a bacterial infection from skin irritation.
Non healing lesion can be a sign of syphilis as well --but usually with hard based ulcer.
Not a common disease.
Another possibility can be a precancerous lesion like Zoon's balanitis.
That is again not common.
The next step will be a consultation with a dermatologist.
If he thinks it necessary, he will do a skin biopsy and send out other tests as relevant.
Thanks for the pictures.
This likely a skin bacterial infection.
Topical antibiotic ointment like mupirocin daily should help with the healing process.
Please also get checked for syphilis as a very unlikely possibility.