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It is highly unlikely that this unfortunately encounter will mean anything. The herpes virus is a fragile one and not easy to transmit unless under certain conditions. You would need some degree of intimate contact for wither the syphilis or herpes to develop a foothold. If you had an opining in the skin it would be possible but only if the virus or bacteria was able to be placed on the area. I would say that you are quite safe. If you are concerned nonetheless, I would wash the area with Hibiclens Wash and apply a Benzoyl Peroxide.