What's this new bump on my dog's ear if it's not bothering her?

Thanks for using Petco Pet Education Center, formerly Petcoach! If it truly was not there yesterday, this is most likely to be a bug bite (tick, mosquito, spider, bee, other), dog/cat bite (if he was wrestling with any other friends lately), or some other random trauma (crashing through a spiky bush or catching it on something). If you're unsure how long it's been there, add cyst, benign or malignant tumor, and others to the list of possibilities. I'd slap some neosporin on there twice daily and watch it. If no improvement in 3 days (or if worsening at any time), it's time to see the vet. This goes for any accompanying facial swelling, vomiting, or diarrhea, as these could be signs of serious allergic reaction. Best of luck to you and Lucky!

That does look to be a mass. A mass is a collection of cells and can be benign (inflammation, cyst, some tumors) or a malignant tumor. Given the age of your dog this may be a histiocytoma, but as many skin tumors can look alike the best plan to confirm this is for your vet to perform a needle aspirate for cytology. That way you will know for sure if this can be monitored or if it needs any therapy. I hope this helps and thank you for using Petco Pet Education Center, formerly Petcoach!

It may be a benign growth (sebaceous adenoma) or not. You can monitor it for rapid change or growth and then have Pumpkin seen by your veterinarian or you can schedule an exam sooner. Whichever choice you make, your veterinarian may aspirate the mass to collect samples for pathology and identification. He or she may also surgically remove it and submit it for pathology. If the bump starts to bother pumpkin, place an e-collar (cone) on him to prevent scratching and schedule an exam.

I suspect this is a histiocytoma, in which case, it should resolve on it's own within a few months. Don't put anything on it, just leave it alone. If it does not go away in a couple months then have your vet check it. ( https://veterinarypartner.vin.com/default.aspx?pid=19239&id=4952066 )

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! I do not think the mass has anything to do with being bitten in the area. It looks like a sebaceous adenoma form your picture (benign). It is very small and I recommend, if Lilly is a calm dog, removing it locally with lidoacine and a punch biopsy. It looks smaller than 8mm which makes it easy to take off with out anesthesia. If you decide not to take it off, I think that is fine. Dogs that form sebaceous adenomas tend to form more throughout their lives. Sometimes the dogs will lick or irritate them prompting owners to want to remove them. I hope this helps and I wish you and Lilly the best!

This looks like a wart or benign skin growth. Many dogs get these as they age. Unless it grows quickly it’s nothing to be overly concerned about. I recommend measuring it and taking a photo every few weeks so you can watch for any change. If she starts scratching it that may be a reason to remove it or if it changes and gets bigger. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Athena.

Monitor for redness, discharge, active bleeding or odor. A minor wound may heal on its own. Keep the area clean and dry. Use an e-collar (cone) to prevent scratching or rubbing if necessary. If it doesn't appear to be healing, see your veterinarian for an exam.