I have attached a photo (it's not too gory!) but just today Leeroy came inside and I noticed his anus was pink (not red) and slightly swollen, he usually pays a lot of attention to licking that area and is wormed regularly. I am going to take him to the vets tomorrow but just thought I'd ask your advice on what it might be? He doesn't seem to be in discomfort and is not scooting along the floor at all...
Thanks in advance for your help!

Kat