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Hi, this is Dr. Gabby.
I am going to have to ask some more questions about the black goo.
What is your dogs age and breed?
Any itching or scratching?
Does the goo have an odor? Maybe like wet corn chips or yeast?
If you would like to post a picture of the goo I would be happy to look at it. Use the paperclip icon at the top of the tool bar.