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My dog has a red bump on his groin, and it's spreading. What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 1 year and 5 months old | 65 lbs

My dog has a bump around his groin and it is very red. And two other red spots around the same area but without a bump. We took him to the river yesterday and when we returned I had noticed just one red spot. This morning, it looks like it has turned into a bump and spread to the other two spots. I did put hydrocortisone cream on it, but doesn't seem to be helping. It could be a bug bite, but its concerning me that it has spread.

1 Answer

Most Helpful Answer

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Answered By Kevin Sanada, DVM

Veterinarian

Published on August 6th, 2017

Red spots could be one of a couple different things: 1) A blood blister - usually get these from some sort of pinching or biting to the area. 2) Tumor - there a a couple of different tumors that will look red. The severity depends on the type of tumor. Your description of the red spot going away and turning into a bump is not quite clear to me, but I'll assume you mean that it is still red and is now raised. If that is the case, then it is most likely a tumor; especially since there is more than one. Don't panic just yet though. There is a type of red tumor that we commonly see on the abdomen and around the groin that will spread to different areas of the skin, but usually does not spread to internal organs. If you notice that these bumps are growing and spreading, then my best recommendation is to have a veterinarian do an exam. They will be able to take a sample of one of these bumps and determine exactly what it is. If it is a tumor, then the sooner you discover it, the better chance it has at being successfully treated.

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