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This is the proof that sun can cause premature skin aging [Health]
posted June 27 2012 17:59.21 by Giorgos Lazaridis

In this photo is a 69-year-old man who worked as a driver in a delivery truck for 28 years. The left side of his face was exposed to UVA and UVB radiation of the sun all that time. The damage is obvious. Scientifically it is called dermatoheliosis or the Favre 13Racouchot syndrome of photodamaged skin.

A 69-year-old man presented with a 25-year history of gradual, asymptomatic thickening and wrinkling of the skin on the left side of his face. The physical examination showed hyperkeratosis with accentuated ridging, multiple open comedones, and areas of nodular elastosis. Histopathological analysis showed an accumulation of elastolytic material in the dermis and the formation of milia within the vellus hair follicles. Findings were consistent with the Favre 13Racouchot syndrome of photodamaged skin, known as dermatoheliosis.

The UVA and UVB radiation penetrates the glass, the epidermis and the upper layers of the dermis. Long-time exposure to these wavelengths results in thickening of the epidermis and destruction of elastic fibers. Worst, this photoaging effect is contrasted with photocarcinogenesis. And even worst, UVA has been shown to induce substantial DNA mutations and direct toxicity, leading to the formation of skin cancer.

[Link: New England Journal of Medicine]

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