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The constant trauma from scratching has caused the skin to become darker and thickened. This creates a vicious circle, because the skin's ability to fight infection is reduced, making secondary problems with itchy yeast or bacteria more likely. It's important to identify the cause of the original itch (parasites or allergy) and correct this, along with using antibiotics or antifungals (as appropriate) to correct the secondary issues. A vet is the best choice to help your dog recover.
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