Why is my senior dog's skin rash turning black and crusty now?

Question

My 10 Year Old Border Terrier bitch has had an increasing number of skin tags. She has had a red rash on the inside of her thigh/ belly for some time which has not been causing her any discomfort. This localised rash has now become crusty, raised and black. Should we see a vet immediately? Thanks. Pet's info: Dog | Border Terrier | Female | spayed | 10 years and 10 months old | 19 lbs

Jenny, DVM · Accepted Answer

If the rash and skin problems is spreading and getting worse, then it is worth see a vet. She may need a skin biopsy or sample to find out the cause. Skin tags are common in older dogs but rash that is changing is not. They may need to do blood work to see if there is an endocrine problem such as a low thyroid or cushings disease.

Why is my senior dog's skin rash turning black and crusty now?

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