HuffPost may receive a commission from some purchases made via links on this page. Every item is independently curated by the HuffPost Shopping team. Prices and availability are subject to change. Hyperpigmentation of the skin isn’t uncommon, but unlike your run-of-the-mill sun spots, melasma is arguably one of the most clingy and temperamental skin conditions to treat once it appears. Melasma, which appears as irregular dark patches along the forehead, upper lip and cheeks, is sometimes called