I Agree with Jorge. This really isnt the place on the internet to ask those kinds of questions. This is a place for people to do Q&As on experiences and policies for specific locations that Google senses you have been or been within close proximity to with their GPS feature on your phone.
Don't know,i don't work there, but i would have it checked out
Anything that it could be i.e. cysts, bone growth, skin infection, ringworm would need to be diagnosed by a vet Everything but bone cancer should be inexpensive to treat.
Best to make an appointment and get it looked at.
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