Two patients presented with papular eruptions that could not be diagnosed clinically. Biopsies of these lesions showed eosinophilic pustular folliculitis (EPF). Both cases were subsequently found to have infestations: one as a result of cutaneous larva migrans was successfully treated with ivermectin and the other caused by scabies mites was successfully treated with topical pyrethrin. The two cases of EPF presented emphasize the need for careful clinicopathological correlation to determine the cause.

A 38-year-old man presented with numerous dermal nodules, similar to xanthoma disseminatum, that were histologically consistent with his diagnosis of Erdheim-Chester disease, a non-Langerhans cell histiocytosis. Other cutaneous manifestations of this disease include eyelid xanthelasma, pretibial dermopathy and pigmented lesions of the lips and buccal mucosa. The histological diagnosis of Erdheim-Chester disease was originally made on the patient's retroperitoneal tissue, obtained at a laparotomy for surgical treatment of a presumed phaeochromocytoma, and confirmed by the pathognomonic long bone X-ray findings of this disease.