It's very possible that it will calm down greatly with handling, LOTS of handling.
After it's fully healed that is.
Take a closer look, hands on if possible to see if it is healing, looks fleshy and puss filled, regrowing scales or what. Your nose can help here too.
If it smells rotten, then it is necrotic and needs a vet asap! Anything infection like - vet.
Ask if they have a normal vet.
A lot of pet stores do have a vet on file, just to cover some legalities, but most times do not take the animals to actually see the vets.
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