A. Some cats are very sensitive to the ingredients in frontline and hairloss and reddening is a recognised undesirable effect. I recommend you use a different product in the future, preferably an oral product as it is usually the carrier ingredients which are related to the sensitivity and not the fipronil medication so many spot on medications could have similar effects. It should heal uneventfully but if the skin becomes broken or painful it may require treatment by your vet - be sure to mention what was applied and take the batch number with you If you still have the packet
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