I’m sorry to hear that your cats are in distress due to botfly larvae. Botfly larvae are parasites that typically attach to the skin of cats and other animals.
The best way to remove them is by carefully using tweezers to grab the larvae and gently pull it off the skin.
You may want to consult with a veterinarian to be sure the larvae have been completely removed and that there are no additional parasites.
In the meantime, try to keep your cats calm by providing them with a quiet, safe environment and play some soothing music to help reduce their stress.
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