There are several causes that can lead to the development of hyperpigmentation on the skin. One of the most common causes is sun exposure. Ultraviolet (UV) rays from the sun can stimulate the overproduction of melanin in skin cells called melanocytes. Repeated and excessive sun exposure over time without proper protection often leads to darkening of the skin. https://articlescad.com/hyperpigmentation-treatment-devices-the-latest-advancements-in-light-and-laser-technology-3902.html