I just got back from an 11 day vacation and noticed a sore on Bentei's stomach. Bentlei is about 4 years old and fully vaccinated. I have only been home for a day but so far he has seemed as cheeky and healthy as always, eating and drinking as usual. The sore is very small and feels like a bump when you touch it, is red and on the right side, an inch under his genitals. Is this anything to worry about? Picture below: