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Environment. Pollen is one of the main irritants, but many different things within a dog's environment can cause crusty scabs and skin irritation. Anything from fertilizer to shampoo can be the culprit of crusty scabs on your dog.
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The most common cause of allergy symptoms in dogs is pollen which causes symptoms when inhaled as well as when contacting the skin.

We don't know the reason why some dogs develop allergies.

Allergic dermatitis can cause itchy skin, hair loss, redness, bumps, scabs, darkened skin, moist skin, and abnormal odors.

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