hes about 1.5yo (non neutered) and has had this neck wound for over 4 months, it used to be way bloodier and its looking kinda better but it keeps opening and bleeding, and lately its developing a weird gray jelly-like area to it?

info that might be helpful? sorry if its useless:

- hes very skinny which im also concerned about because it could be a contributing factor- i feed him and his brother dry food once a day, but he struggles with chewing and keeps accidentally dropping his food. he manages better with wet food because he can use his hands for it, but i cant afford to buy it every time.

- he constantly gets bullied by an older female cat when he eats which makes it harder- she bites his wound and ears alot, which i think is probably the reason the wound never heals. 

- i think he overgrooms because he keeps licking himself constantly and has matted hair. i cant check if he has fleas because he wont let me touch him, but his brother is very clean and doesnt have any black spots on him.

- i live in the middle east and he sleeps under my house which is mostly mud and dirt, and there are a lot of brown mushrooms and flowers around (purple heart plant, a dried bush i cant identify, and i think green onion?) which i havent seen him eat but his brother does from time to time.

i cant afford to take him to a vet (and cant reach one without a car that i do not have). theres only one store in my village and it doesnt sell a lot of animal medicine but it has flea treatment for dogs, and iodin/etc for humans if it helps?

im really concerned that the grey stuff could be an infection or anything else thats dangerous, and want to help any way i can. if anyone has experience with a stray with these types of wounds please let me know😭🙏 thank you so much in advance🙏🙏🙏

stray kitten neck wound for around 4 months