Hyperpigmentation is a complicated condition faced by many skin care professionals and clients alike. Explore the mechanisms of melanin formation and melanocyte function as well as associated states of hyper-hypo pigmentation. Learn about newly discovered lightening mechanisms, such as melanasome transfer (MIT) and melanin stimulating hormones (MSH) inhibitors that are key components in melanin formation. Discuss specific treatments for melasma, inflammatory hyperpigmentation and photo damage.