This was explained by Mary Lupo, MD, a skin specialist clinical areas at Tulane University School of Medicine. He then suggested another, more effective solutions, that is by applying natural ingredients on our bodies. One example of the use of natural ingredients for beauty that you may already know is yam (also often called bengkoang).
Plant these bulbs commonly found in masks, scrubs, facial soaps, moisturizers, and lotions. Bengkuang proved refreshing, because the root tuber of yam has a high water content, about 86-90 percent, so the moisturizing effect.
Meanwhile, in a study entitled The Exploration of Whitening and Sun Screening Compounds in Bengkoang Roots (Pachyrhizus erosus) by Endang Lukitaningsih from Universität Wurzburg, Germany, noted that yam contains vitamin C, flavonoids, and saponins which is a natural sunscreen to prevent skin damage by free radicals. Plus, phenolic substances of yam is quite effective in inhibiting the formation of melanin, so the pigmentation due to hormones, sun, and acne scars can be prevented and reduced.
Suggested usage
Products made from yam can be applied to the face and body. Please try to make their own yam masks.
How: Peel and clean the yam, and scar until smooth. Glue evenly on the surface of the face or skin area stained. Let stand until dry, about 40 minutes, then rinse with clean water. Do it 2-3 times a week.