or Norwegian scabies, is a severe form of the infestation. This results in hard, yellowish-brown, or gray crusting on your skin that often develops on the scalp, ears, elbows, and soles.

Various underlying conditions can cause an itchy scalp without dandruff. Examples include head lice, hives, and dermatitis. The scalp may also be sore, dry, or tender. Treatment can depend on the ...