The pics look like small puatules which would be typically due to common skin flats bacteria such as strep species or staph aureus species. If pustules then strep would respond nicely to amoxicillin but staph not at all. Topical antibiotic such as Neosporin cream or ointment could be applied twice a day and these may respond to that
Now puzzling part of the picture is that you say these clear in only a couple of hours ???
A bacterial infection would not clear so quickly ---?.?
Hives may come and go in brief span of time but pics do not look like hives/ urticaria to me ??
Question placed under HIV category ?? Nothing seems suggestive of HIV ---
Let me know if you have further information or concerns --- also any pain or soreness or itching with these ??
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Anthony Bray MD