What's causing this sore on my dog's snout that's lasted 5 days?

Question

My dog has a sore on the side of his snout. It has been there for about 5 days. Pet's info: Dog | Labrador Retriever | Male | neutered | 85 lbs

Jessica Keay, DVM · Accepted Answer

I am sorry to hear about Simba! I would recommend an examination by a veterinarian if Simba has had this lesion for 5 days with no improvement. It is difficult to say without being able to see Simba in person, but it is possible this could be what is called a cuterebra which is a fly larvae which embeds within the skin causing a small nodule with a central pore where the larvae can be seen (in this image it almost looks like I can see the larvae in the center of this photo but as I said, since it is a photo we can't say for certain). Other things we would worry about would include a small infected nodule, a ringworm infection causing a small granuloma, or a growth called a histiocytoma. I would clean the area with a mild soap and apply a topical antibiotic such as neosporin, and call your vet when they open next for an appointment.

What's causing this sore on my dog's snout that's lasted 5 days?

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