Why is my dog licking a popped red lump on his leg with hair loss?

Question

My kelpie x border collie had a small bright red lump on his back right leg, up near his tail. He has clearly popped it but since then he has been constantly licking the area and all of the hair in the area has gone. Do you know what this could be? Pet's info: Dog | Border Collie | Male | neutered | 6 years and 3 months old | 90 lbs

Laura Johnson VMD · Accepted Answer

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Sadly a lot of skin masses can look the same. It could be a Mast Cell tumor (which is a cancerous growth that should be removed and biopsied), a cyst, a histiocytoma (though he is a bit old for that, they end to occur in younger dogs). Any skin bumps that is new, rapidly grows, changes or is possibly infected should be checked by a Vet. They can decide whether it should be aspirated and sent to the lab or removed surgically to send the entire specimen for biopsy. I hope this helps and I wish Boston the very best!

Why is my dog licking a popped red lump on his leg with hair loss?

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