The nails are too long and go into the flesh.
Wear thick gloves first to prevent the cat from scratching. It is best to have another person hold the cat. Cut it in the middle with pedicure pliers, and then pull out the nail tip that is embedded in the flesh. If bleeding occurs, use cotton swabs and claymycin powder to compress and stop the bleeding. The remaining nails are shortened and rounded.
Thick nails may be caused by stimulation and hyperplasia. If the cat behaves normally, you can leave it alone and see a veterinarian if necessary.