What are these black spots & pimples on my dog's thigh after grooming?

Question

A few weeks ago, after my dogs grooming, i noticed he was scratching/biting a certain area a lot. We trimmed his hair very short so i just thought i was because of his hair growth. he stopped biting the area about a week ago. no signs of hair loss but today i notice something on the side of his right back-leg thigh. it’s like small pimples, but with a black pigment in the skin, like if it is dirty. he is acting fine. there is also one little red pimple with a very small scab that he must’ve popp. Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 3 years old | 14 lbs

Jenna Beyer, DVM, MBA, cVMA · Accepted Answer

The rust color to Max’s hair in this area is saliva staining from licking. This could still be happening from the grooming, or could be some other source of itching such as fleas, allergies, skin infection, etc. Make sure Max is on a good monthly flea preventative! The dark spots could be clogged hair follicles or flea “dirt” (aka flea poop). You can try a cleansing shampoo that will help to clear the follicles (like this one https://m.drsfostersmith.com/product/prod_display.cfm?pcatid=21564 ). If Max is still licking or additional skin things pop up in the next few days, he should be examined by a vet for a diagnosis so he can get appropriate treatment.

What are these black spots & pimples on my dog's thigh after grooming?

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