Table 1.

Differential Diagnoses of Erythema Ab Igne and Its Mimickers

Etiology	Examples of Conditions
Autoimmune/Connective tissue diseases	Dermatomyositis, Sjögren syndrome, Vasculitides (e.g. polyartertis nodosa), Systemic lupus erythematosus
Environmental (e.g. heat) exposures	Chronic pain, Eating disorders, Electronic use
Hematologic/Hypercoagulable	Antiphospholipid antibody syndrome, Deep venous thrombosis, Thrombotic thrombocytopenic purpura
Infections	Mycoplasma pneumonia, Brucella, Parvovirus B19, Rheumatic fever, Endocarditis
Medication Exposures	Amantadine, Bismuth, Memantine, Minocycline
Neurologic	Reflex sympathetic dystrophy, Encephalitis, Susac’s syndrome
Physiologic/Benign	Cutis marmorata