She related the onset to significant stress at her job. Unknown. Biopsy showed lichen simplex chronicus. There are no clinical manifestations. Some areas of the skin may be predisposed to pruritus ...
p-Phenylenediamine, the allergen of the year? Why now? Granted, p-phenylenediamine (PPD) has been the leading permanent hair coloring agent or oxidative hair dye in most of the Western world since ...