Last night my cat was curled up next to me and I noticed her stretch, and the side of her belly/ribs area was bright red, bald and it was clear she'd been licking it A LOT. She didn't seem to be distressed so was very careful not to catch the patch when fussing her.
This morning I've checked the patch again and it's much less red(guessing she's not been licking quite as much) and it's now just a pinky colour, with just a couple of black hairs left on it. Again though, she seems perfectly fine in herself and has been meowing as she normally does when I come downstairs.
I used a frontline spot on on the 11th, but I thought if she was having a reaction it would have come sooner than this. I've also taken her collar off because it's glitter and I don't want any falling off and irritating it(she's been wearing it all summer).
Does anyone have any idea what it could be? Google was very unhelpful with answers and kept showing me skin problems that look nothing like what she has!
If it helps, she's mostly black and a little podgy. And about 4 years old.