The present disclosure relates to novel methods for using treprostinil or its derivative, or a pharmaceutically acceptable salt thereof, for the treatment and/or prevention of ischemic lesions, such as digital ulcers, in subjects with scleroderma (including systemic sclerosis), Buerger's disease, Raynaud's disease, Raynaud's phenomenon and/or other conditions that cause such lesions. The disclosure also relates to kits for treatment and/or prevention of ischemic lesions, which include an effective amount of treprostinil or its derivative, or a pharmaceutically acceptable salt thereof.