You honestly do not need to worry , nothing is passed on that easily and Clinics are extremely clean for this reason. If u both tested negative u are absolutely fine even if he did masturbate u 5 hours later
Difficult to see from the photo as it’s not very clear. It might be hair follicles that have have grown under the skin if you shave closely it’s even more possible. It can develop into an infection if not treated so I would get it looked at. Are the pimples sore to touch.
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