What is this round lump on my puppy's leg after a scab came off?

Question

Puppy has round lump on skin by knee of back leg. Only on skin, perfectly round. Was brushing today and scab came off. No blood and doesn’t bother. 3month lab/boxer/poodle. Pet's info: Dog | Mixed Breed | Male | unneutered | 3 months and 26 days old | 35 lbs

Laura Johnson VMD · Accepted Answer

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Since Odie is young, it is likely a benign growth called a histiocytoma. Histiocytomas are pink hairless, button like growths commonly found on the limbs of young dogs. They spontaneously regress on their own in 2-3 months. They tend to ulcerate before they regress. If the growth increases in size rapidly or Odie keeps traumatizing it or it doesn't resolve in a reasonable time frame consider surgical removal and biopsy. I hope this helps and I wish Odie the best!

What is this round lump on my puppy's leg after a scab came off?

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