What causes hyperpigmentation?
Hyperpigmentation is caused by melanin, the natural pigment in your skin that determines its colour. Melanin is made by skin cells called melanocytes, and the more melanocytes you have the darker your skin tone. These melanocytes in your skin can react to inflammation and damage to the skin, causing it to overproduce melanin. This leads to patches of skin that are darker than the skin around it, also known as hyperpigmentation. Melanin also absorbs UV rays, which can mean that hyperpigmentation looks darker after being outside in the sun.
Hyperpigmentation can appear anywhere on the body or the face and tends to show up after following breakouts, rashes, insect bites or cuts to the skin. It can also happen after piercings, injections, sun damage..