Question

I have a 3 year old neutered male house cat. He has been very healthy up until about 4 months ago. It all started when he scratched his forehead with his back claws and made it bleed quite a bit. It scabed over but it would not go away. I brought him to the vets to see what they thought. Well as you can guess they gave him a course of that sickening bubblegum flavored antibiotic. They also had me change his food to Science Diet duck and pea formula thinking it was alergy related. Everything was ok for a short while but he did not like that antibiotic and because of the stuff we had to go through to give it to him (wrap him in a blanket so he would not scratch us) he started hiding under furniture and it seemed that shen we would find him he would find another place to hide. Well I changed his food and his litter to a newspaper kind with no scent that might cause a reaction. But now he is licking the fur from his chest and it is so raw and ozing. Can you help him?