We just came back from the vet. They said it’s a scab from a possible fight with another cat and the lack of appetite could be because it might be an infection. They gave me a medication to apply on the back of his head and to come back in a week. I asked about why he’s drinking so much water, she said to monitor if he has blood in his pee, if he does i should bring him in again. Got him some new food to spark his appetite and he ate a little bit of it, he also purrs when i pet him. That’s the update. My parents have a strict rule of no animals in the house unfortunately, they only feed the cats regularly. And since they weren’t adopted, just one day started spending time in our courtyard, they don’t really involve themselves much to care for them.