Hi this is my first year owning rats and within the first year I have adopted 6 rats total. One of the rats I got from someone rehoming them is a year old and 3 months and I think he has an a chess. I was picking him up today and felt a bump. I immediately thought it was a tumor and was very scared. However I believe it’s an abcess. It’s very hard and looks really bad. It’s Saturday so I will call the vet on Monday and get an appointment as soon as possible but I’m very worried. Please help! Here’s a picture of the wound. It’s right near his left armpit.