Hello
I’m sorry to hear about your cat.
I think that you need to find a veterinarian or a veterinary technician who can show you how to do this. I would also recommend you start gentle physical therapy and feed canned food to keep the feces soft and able to pass more easily.
Licking the spot usually means it’s irritating in some way. I’d absolutely get him to the vet.
Hello,
It is not possible to diagnose any lesion based on a picture. A diagnosis of a mass is only made after a tissue sample is analyzed by a pathologist. I would see your vet and ask them to give their best guess as to what it is and I would also ask them about the possibility of it being a histiocytoma. Even this is only diagnosed after a biopsy. Let us know what they say.
His appointment is next Wednesday, my heart is breaking in the meantime