My dog has a swollen spot with hair loss. What could be the cause?
Thanks for using Petco Pet Education Center, formerly Petcoach! It is difficult to tell from the photo where this lesion is located. However, with anything under the skin that is growing, we become concerned about an infection (abscess formation), a mass of some kind, or a blood accumulation (hematoma), among others. I would recommend Rokko be evaluated by his regular veterinarian to determine the underlying cause for his skin swelling/redness, have any necessary testing done (needle aspirate, culture) and start any treatment that may be needed. Good luck!
Updated on September 23rd, 2025