very small red painless itchless blister spot when squeeze put
Related to friction or acneform eruption, topical antibiotic
Welcome to 'Ask A Doctor' service...
I have gone through your query and reviewed the attached photograph.
It could be due to friction associated with intercourse or an acneform lesion on the penis.
I would recommend you to apply a topical antibiotic like Neosporin ointment on the affected area twice daily for 7-8 days.
This should resolve it.
Hope to have answered your query.
I would be happy to answer any further queries.