Hi all, I'm assuming at the moment that this is nothing but I would like some second opinions just incase. I'm a 22 year old male, just got back from Cancun two days ago and noticed I have a light brown spot on my lower lip. Being out in the sun for that long points to it just being a sun spot, however, I did party quite a bit and wound up kissing a Brazilian girl pretty intensely. I was really drunk and don't remember the whole thing much but I'm a bit worried if maybe she could have passed something on to me? Not to sound racist, but I'm not familiar with common diseases or STD statistics over in Brazil so I'm a bit worried. It doesn't itch, burn, or tingle and it's not bumpy. It appears to be on the outside of the skin just like a tan. I've been treating it like a herpes sore, washing my hands constantly if I think I touched it etc. So some input to maybe put my mind at ease would be wonderful as I currently have no health insurance.

Thank you to those who reply.