[Systemic diseases and ulceronecrotic angiodermatitis].

The discovery of ulceronecrotic angiodermititic ulceration should mean that systematic clinical and paraclinical examination is carried out to look for a general cause. During these examinations the search should be for infectious causes on the one hand, and haemoglobinopathy on the other, and an examination of the ganglionic areae and of the spleen should be carried out. The examination might also lead to the discovery of localised or systemic vascularitis: the clinical examination should check for any disintegration of the general state, temperature, signs of neurological, digestive, cardiac, pulmonary localization, etc. The biological examination should show up any signs of inflammation and, eventually, a biopsy of cutaneous elements or of muscle should be able to show vascularitis. Ulceronecrotic angiodermititis should therefore not always be considered as a local pathology but sometimes as an element of systemic affection.