Titanium metallic discoloration has been reported to have occurred with titanium-containing ointment causing papules on the penis of a patient.James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. . Titanium screws used for orthopedic procedures, if they come near the skin, can also causes cutaneous blue-black hyperpigmentation.
See also Skin lesion
References