Petco Text Logo
Petco Pet Logo

My dog has painful black gunk on his lips. How can I help him?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 5 years and 8 months old | 25 lbs

My dog, Toby, is 5 years old and has had black gunk on his lower lips since I adopted him in December. They appear to be painful to touch, he certainly doesn't like us touching his mouth. They are attached like a scab and then eventually disconnect and hang on the fur. Is there anything we can do to clean it up?

This question includes photos that may contain sensitive content. Click to view.

View more to consider that the photos may include sensitive content.

1 Answer

Most Helpful Answer

Image profile

Answered By Jenna Beyer, DVM, MBA, cVMA

Veterinarian, Certified Veterinary Acupuncturist

Published on September 7th, 2020

The scabs and gunk building up indicate that the skin underneath is not healthy, which could be caused by a bacterial or fungal infection, autoimmune disease, among a few other things. i would recommend taking Toby to the vet for examination and possible biopsy or bacterial culture. You can try using a warm wet washcloth to soften the scabs, but I wouldn’t push it if he seems uncomfortable.

Vote icon

4Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored