Okay so my kittens are about 7 weeks old and very playful but the a couple of days ago i notice that one was just sitting around and always sleeping. We started taking extra care of it and then i noticed that it had a scab on the left side of its chest. I think that it has gotten scratched or something and i thought that it would just get better. but now it has big bump around and next to the scab that feels like it is full of fluid stuff. it is squishy. I think it has gotten infected. What should i do about this lump? Please help me!!!!