Gastrointestinal (GI) disorders Skin conditions commonly associated with GI disorders include Pyoderma gangrenosum: Inflammatory bowel disease Lichen planus and porphyria cutanea tarda: Hepatitis C infection Diffuse hyperpigmentation in patients with diabetes (known as bronze diabetes): Hemochromatosis Erythema nodosum: Inflammatory bowel disease, sarcoidosis, and various infections Eruptive xanthomas: Elevated serum triglycerides