There is many ways to detect a big warble in your cat, 1st by swelling bellow the surface of the skin, or the animal may show signs, so the most common symptom to that is a raised opening in the lump so that that it may breath.
The opening in this one has been spotted in her face and the kitten has definitely felt some suffering as it was being removed,
Normal skilled veterinarians should be able to get them out if they are in the migratory stage and has settled into a spot just on the surface of the skin.
See more of Maurice Vet clinic, and the friendly staff where you will never about your pet there here:
Source: ViacomCBS Inc.
Source:https://youtu.be/febZor8Uvs0
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