If the cat's injection is injected into the skin, it may cause local swelling. The cat needs to be given a hot compress. It will usually disappear within three days. If it does not disappear within three days, you need to go to the pet hospital for examination and treatment to avoid delaying the condition.
Tip:
If the drug is highly irritating, the cat may feel pain, and the cat needs to be watched to prevent the cat from scratching the injection site and causing infection.