By far the most common cause of penile blister-like sores, especially with redness, is genital herpes. You do not have to be sexually active recently to have herpes: if you have ever had sex, and with just a single lesion, if it's herpes probably it is a recurrent outbreak of infection acquired months or years previously. Get seen ASAP: accurate diagnosis of herpes requires test within 2-3 days.
Answered 8/13/2023
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An irritation a bite or local infection (NotUTI). Pl see your doc or urologist. Good luck
Answered 8/14/2023
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