[Pitfalls in the diagnosis of chronic leg ulcers].
D002294:Carcinoma, Squamous Cell / Q000150:complications; D002908:Chronic Disease; D005534:Foot Diseases / Q000150:complications; D006801:Humans; D007871:Leg Ulcer / Q000175:diagnosis* / Q000209:etiology; D008207:Lymphatic Metastasis; D008545:Melanoma / Q000150:complications