In this article, a case is presented in which repeated needling of the Yin Tang point over the course of 6 years was perceived to cause pigmentation and textural changes to the skin. Others have reported changes to pigmentation, but those changes were either shorter lived and associated with strong stimulation, or were associated with implanting a silver needle for several years. © 2014.
Cooper, F. (2014). A case study of pigmentation and textural changes associated with needling yin tang. JAMS Journal of Acupuncture and Meridian Studies, 7(2), 95–97. https://doi.org/10.1016/j.jams.2013.05.001