Effects of <10-μμm Particulate Matter on Cultured Human Sebocytes and Outer Root Sheath Cells and Usefulness of Siegesbeckia Herba Extract

Background: Particulate matter (PM) is one of the air pollutants that can damage human skin; the recent increase in the amount of PM may be detrimental to skin health. Objective: We aimed to investigate the effects of PM on cultured human sebocytes and out- er root sheath (ORS) cells and the effects of Siegesbeckia Herba extract (SHE) on PM-treated cultured cells. Methods: Sebocytes and ORS cells were cultured. The cultured cells were treated with various concentrations of PM of