Parade aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission. Dark spots are one of the most frustrating skincare concerns because ...

Maria L. Mihailescu, MD; Arianne Gonzalez, BS; Vidya Shivakumar, MD Exogenous ochronosis (EO) is a rare adverse effect of topical hydroquinone characterized by blue-black or gray-blue pigmentation, ...