What causes my old dog's recurring oily, black, crusty skin scabs?

Question

My senior terrier has developed sebaceous adenomas and seborrhea in his old age. I just found a huge oily scab on his back. It is black a nd crusty on the outside and yellow gooey on the inside with a raw raised welt underneath. No blood really. Not sure if the discharge is pus or sebum. He had a smaller version of theirs a year ago. I disinfected it and it quickly went away but left a scar. Any ideas what this could be or why it keeps happening? Thank you!!

Jessica Keay, DVM · Accepted Answer

Unfortunately some of these cysts and adenomas do tend to rupture and become infected repeatedly. If that is the case we often do recommend removal to avoid this continuous cycle. It may also be advised to remove it to ensure that it is a benign adenoma and not something more concerning or aggressive.

What causes my old dog's recurring oily, black, crusty skin scabs?

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