UVA as well as UVB radiation is what makes people tan. These rays penetrate to the lower layers of the epidermis, where they trigger cells called melanocytes to produce melanin when a person is exposed to sunlight for a long duration.
Assessment of the severity of tanning is done after which adequate sun protection measures and medical treatment is advised. If pigmentation is more stubborn, then services such as the following can definitely help.
Anti- Pigmentation Lasers