Time course effect and sequential morphological changes of subepidermal nerve fibers in guinea pig skin after application of histamine ointment: a laser scanning confocal fluorescence microscopic and electron microscopic study.

This study was undertaken to elucidate the morphological effects of histamine on subepidermal nerve fibers. A 10% histamine ointment was topically applied to the back skin of 17 adult male Hartley guinea pigs. Biopsy specimens were obtained at times from 5 min to 24 h, and were examined by conventional immunofluorescence (IF), laser scanning confocal fluorescence microscopy (LSCM) and transmission electron microscopy.

A case of non-selective phagocytosis of hemosiderin and melanin of dermal histiocytes in stasis dermatitis.

A case study was undertaken to determine whether or not the same dermal histiocytes could phagocytose both melanin and hemosiderin simultaneously. A biopsy specimen was taken from a pigmented lesion of the lower leg of a 57-year-old woman with stasis dermatitis. The specimen was processed for histology, conventional transmission electron microscopy and electron-probe X-ray microanalysis.