my cat went bald after putting a hartz flea collar on

i put a hartz flea collar on my cat baby and she started going bald and grooming too much she also had small spots covering most of her body which where swore i took her to the vets and they said she was allegic to fleas i thought this was strange as she had never had a problem for 2years when i got her home i took the collar off and she has now started to grow her hair back

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