Acute hemorrhagic edema of infancy: case reports and a review of the literature.

Acute hemorrhagic edema of infancy (AHEI) is an unusual form of leukocytoclastic vasculitis that affects children younger than 2 years and frequently is preceded by drug intake, vaccination, or a variety of infections. It is characterized by an abrupt onset of fever, purpuric lesions, and peripheral edema on the face and extremities that may be confused with other dermatoses. The course is benign with spontaneous resolution.

25-Hydroxyvitamin D, cholesterol, and ultraviolet irradiation.

Vitamin D deficiency may have implications for cardiovascular health. The purpose of this study was to determine the relationship of 25-hydroxyvitamin D (25[OH]D) to cholesterol and lipoprotein particles and to determine whether increasing 25(OH)D through ultraviolet (UV) irradiation impacted on these parameters in healthy young men and women. This was a randomized trial of 51 adults exposed to suberythemal doses of whole-body irradiation using UV lamps that emitted UV-A and UV-B radiation, compared with a control group, twice weekly for 12 weeks.

Sunscreen ingredients inhibit inducible nitric oxide synthase (iNOS): a possible biochemical explanation for the sunscreen melanoma controversy.

Sunscreen products are rated upon their ability to inhibit visible redness of the skin 24 h after measured doses of ultraviolet (UV) exposure (Sun Protection Factor, SPF). Although sunscreens prevent UV-induced redness, their ability to protect against melanoma or the development of moles is less clear. UV-induced redness occurs in part by the action of nitric oxide (NO), synthesized in the skin.