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Shining a Light on Skin Brightening
By: Lydia Sarfati
Posted: May 31, 2012, from the June 2012 issue of Skin Inc. magazine.
Recently, there have been some very exciting advances in skin care science, particularly targeting hyperpigmentation. As a skin care professional, it is important for you to understand how hyperpigmentation occurs, what ingredients to avoid and what technology is available to successfully treat your clients.
How hyperpigmentation occurs
Also called pigment, melanin is a substance that gives skin and hair its natural color. Those with darker skin have higher amounts of melanin. By contrast, those with less pigment have fairer skin. Melanin pigments are formed as part of the process of metabolizing an amino acid called tyrosine. Tyrosine channels the production of melanin and other pigments by oxidation. In humans, melanogenesis is a darkening of the skin, or an increased production of melanin, also called hyperpigmentation. This is a common—usually harmless—condition, during which patches of skin become darker in color than the normal surrounding skin. This darkening occurs when an excess of melanin, the brown pigment that produces normal skin color, forms deposits in the skin.
Although most brightening products work through tyrosinase inhibition, it is possible to influence the process at multiple points. Hyperpigmentation occurs when UV rays from the sun attack the keratinocyte of the skin; the keratinocyte then signals the melanocyte, which initiates the production of melanin. Once the melanocyte receptors are attacked, it triggers tyrosinase, endothelium (ET-1) and alpha melanin, stimulating the alpha melanocyte-stimulating hormone (MSH) to produce melanin. Melanocytes containing melanosomes that carry the melanin pigment travel through their dendritic cells. Once they travel to the aforementioned keratinocyte, they are aggregated, deposited and produce the melanin pigment. This process is called melanogenesis, which creates hyperpigmention.
Ingredients for hyperpigmentation
In the past, ingredients such as hydroquinone and mercury chloride have been used to treat melanogenesis. These ingredients, however, have been linked to a variety of health issues even when used in small percentages.1 Today, natural ingredients are available that can help reverse hyperpigmentation from the sun, acne scars, hormonal changes and certain prescription medications without risking future health complications. Marine biotechnology and peptide research can now help to rapidly reduce the appearance of uneven skin tone while battling hyperpigmentation to reveal a more luminous complexion. Following are some of these ingredients.
Watermelon extract. It helps protect DNA in skin cells from damage caused by UV light-induced free radicals, and decreases erythema after UV irradiation, protecting the skin. It contains naturally occurring vitamins, carbohydrates and amino acids.