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Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today.
First, since you have asked, this question's cost appears to be $22.
If that is acceptable, then can you tell me:
Does the lump feel attached to the bone?
How large is it?
Has she had any limping with this leg?
Does she go outside or is she exposed to other cats?
What are you treating her allergies with?