Anthrax is an acute infectious disease caused by the spore-forming bacterium Bacillus anthracis. Anthrax is most common in agricultural regions, where it occurs in animals. It can also infect humans. Cutaneous anthrax infections occur when the bacterium enters a cut or abrasion on the skin. A case of cutaneous anthrax infection of the arm is presented. The patient needed to undergo a skin graft. He subsequently developed an ulnar nerve lesion after severe edema in his arm and hand.