Skin penetration not yet known a number of factors have been linked to them. Dog's skin can also be genetic. If your dog itches again and again at the same place, then there is a risk of skin tag or lump disease. This is a disease that does not spread and is no more harmful.
If you see any puffy part on your dog's skin, do not panic, but wait for a few days, it will go away on its own. Coming to the skin, you should also understand that the skin is vulnerable and needs to be taken care of properly.
For more: https://healthgroovy.com/skin-tags-on-dogs/