Detailed answer

Hyperpigmentation refers to an excess production of melanin, the pigment that gives color to the skin. It is typically caused by factors such as sun exposure, hormonal changes, skin injuries, or certain medical conditions. The constant use of fitness trackers or smartwatches does not contribute to hyperpigmentation as these devices do not emit harmful radiation or substances that can directly affect the pigmentation of the skin. However, it is important to note that excessive sun exposure while wearing these devices can still contribute to hyperpigmentation if proper sun protection measures are not taken, such as using sunscreen or wearing protective clothing.