[Erythermalgia].

Erythromelalgia is a vascular acrosyndrome affecting mainly the feet and triggered by elevation of room temperature. It may be primary, or secondary, in particular to a polycythemia, when an increased platelet count plays an essential role, explaining the beneficial effect of aspirin or NSAI agents that inhibit platelet prostaglandin cyclo-oxygenase. The favorable action of beta-blockers could result from the possible existence of an anomaly of cutaneous adrenergic nerves.