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That is called lichenification and it is caused by inflammation.

Fleas typically do not cause dark patches but will cause hair loss along the back of the hind legs.

Your dog would also be itchy if there were fleas.

Make sure to get a good monthly flea preventative from your veterinarian.

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A: Sometimes these dark patches can be normal. They can occur in areas of friction (under legs, armpits) or they can be normal pigmentation in your dog's skin that occurs with age. Dogs with severe skin allergies can develop black patches but the skin in that area is thick, itchy, and almost like elephant skin.

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