Someone threw acid on my cousins kitten?

ok my cousins kitten is months old now and someone threw acid on it what should i do the vet said to give it the creams but he keeps licking it off
Update: The vet wont give it a collar it had a neck problem and yes the cat is OK
Update 2: The cats skin is not "Burning" it just took the fur off I meant that is there a way we can get the fur to grow quicker
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