Davis, E.C., & Callender, V.D. (2010). Postinflammatory hyperpigmentation: A review of the epidemiology, clinical features, and treatment options in skin of color. Journal of Clinical and Aesthetic Dermatology, 3(7), 20–31.
Zhao, Y., Yu, J., Liu, S., Zhou, J., Wang, J., Wang, Z., & Liu, Z. (2020). Ecchymosis combined with postinflammatory hyperpigmentation associated with acupuncture therapy: An observational study of 167 subjects. Medicine, 99(4), e18721. DOI 10.1097/MD.0000000000018721