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My dog has a red spot on his arm that's getting bigger. What is it?

Updated on September 23rd, 2025

Pet's info: Dog | Shiba Inu | Male | unneutered | 20 lbs

Hello! I noticed a small red mark on my dog’s lower arm about a week ago. It’s since grown to about the size of a dime. I’m wondering what it is

2 Answers

Most Helpful Answer

Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

Veterinarian

Published on September 28th, 2019

This presentation could be due to a trauma or localized spot of skin infection (likely to be caused by bacteria).
A check up, appropriate disinfection and possibly antibiotics (oral, topical or in a shampoo formulation) are needed to solve the problem.
Disinfection may be started at home with very diluted hibiscrub or betadine or salted water baths. Buster collar may be useful as well to avoid any licking (if any).
Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further. If this answer was helpful please let us know, this will be used to improve our service!

1Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By Amber W
Veterinarian, Certified Veterinary Acupuncturist
Published on September 17th, 2017
That looks like it could be a mild skin infection, irritation from a leash or harness or even the result of an insect bite. If you use a harness I'd suggest not using it for a few days to allow the skin to heal. You can apply a small amount of triple antibiotic ointment to the area.

If the area is not healing in a few days you may want to bring Champ to your veterinarian. Your veterinarian can take samples from the area to make sure it isn't a more significant infection or other skin issue.

Thanks for using Petco Pet Education Center, formerly Petcoach and I hope Champ's skin heals quickly!
1Pet Parents found this answer helpful

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