Hard lumps and scabs on the dog’s head may be skin diseases caused by fungal, bacterial, and parasitic infections, or they may be tumors. If there are local redness, swelling, dander, itching, scabs, etc., it may be a skin disease. The dog needs to be dewormed externally first, then clean the affected area, and then apply antifungal ointment. If there are no other circumstances, it is best to take the dog to the pet hospital for examination.