I just found out I did not buy from breeders. sellers get CH from abroad.Edit: I see now that it’s more than one spot, so less likely a mark made by breeder.
It kinda looks like a small mark the breeder made to identify it. I’ve seen them in photos on many hatchlings from different breeders. If you have only had him a week, you should definitely reach out to whomever you purchased from and ask if they made the mark.