Hyperpigmentation is caused by an increase in melanin. Melanin is the natural pigment that gives our skin, hair and eyes their colour. A number of factors can trigger an increase in melanin production, but the main ones are sun exposure, hormonal influences, age and skin injuries or inflammation. As skin ages, the number of melanin-producing cells decreases but the surviving cells increase in size and their effect becomes more focused. These changes explain the increase in age spots in those over 40.
Hyperpigmentation can also be a side effect of certain hormone treatments.











