Gangrene turns the skin blue, has a foul smelling blister that is infected by clostridia. Gangrene bleeds. Gangrene does not itch.
A healing wound may itch. A worsening wound and an open wound (gangrene wound) do not itch.
Itching of the skin occurs with tinea pedis (athlete’s foot), tinea coporis (crotch itch), yeast (vaginal and crotch itch), and non-infectious psoriasis (dry skin itch).