Melasma is hyperpigmentation. Triggers can range between hormone, sunlight (UV radiation), and heat (stove, fire or sauna); anything that stimulates the melanocytes (pigment cells). Darker complexions may be more prone to the hyperpigmentation. Hydroquinone has been used to treat melasma. I usually recommend a retinoid to help exfoliate if the skin can tolerate. Balance all of the irritants with True Lipids - to hydrate, correct & perfect.