Hiv Risk with barber trimmer.

Hi doctors Yesterday I went to a barber's shop. He uses trimmer instead of razor. So, applies directly on the skin.He had kept the trimmer for, say 5-10 minutes after working on an another person. I asked him to clean with dettol which he said he did, before applying on me. Well, I didn't see him cleaning but he took it to some cleaning area and came back after a minute or two. Then, he applied it. Today(after 20 hours), I saw 2 red spots on my throat, which is mostly the result of the trimmer(but I didn't see or notice any blood coming out at that time when he was working on me.). So, my questions are: 1. What is the chance of HIV, or any other infection? 2. As 48-72 hours have not passed, do I need to go for ART medication? 3. Any advice in this regard will be helpful. Thank you in advance.