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My dog has circular spots after ticks. Could it be a bullseye?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 9 months and 7 days old | 18.8 lbs

Can you tell me what these circles are? They are not “bullseye’s” are they? Pepe is on Nexguard—-that I am working to switch to a Seresto collar along with Wondercide spray. Found these about 15 minutes ago, while removing ticks—-one newly attached and one not attached.

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1 Answer

Most Helpful Answer

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Answered By Christie Long, DVM

Veterinarian, Certified Veterinary Acupuncturist

Published on May 10th, 2018

I agree that these have a "bullseye" look to them, however we don't typically see bullseye lesions in dogs with tick disease, as they do in people (with Lyme disease). Often insect bites can leave this type of lesion, and I'd be wondering whether this was itchy or not, as it could be a mosquito bite or spider bite. Other things to consider would be ringworm and a bacterial skin infection (pyoderma). If Pepe is feeling well that makes me less concerned for tick disease, however based on your zip code Lyme is always a concern, so I would be inclined to get him tested for tick disease as you have found them on him recently.

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