What is this painful pink lump on my 3-month-old puppy's armpit?

Question

My dog has a small pink lump under his armpit. He is 3 months old. I thought it may be a tick bite so I tried squeezing it some and he now crys when picked up if you touch the area on accident. Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | 3 months and 2 days old | 2 lbs

Ricardo Fernandez, DVM · Accepted Answer

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. Given his young age, this could just be a small abscess or site of infection. This is often differentiated by a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have him evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good day!

What is this painful pink lump on my 3-month-old puppy's armpit?

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