Sun Damage

Sun Damage


Local Erythema- reddening of the skin due to increased activity of the blood vessels

Thickening of the skin- UV has a stimulating effect on the cell-producing layer of the epidermis, causing thickening of the skin. This acts as a protection against further irritation of UV light.

Desquamation- UV accelerates the skins normal shedding process. Amount of peeling varies with the strength of the erythema.

Pigmentation- Wavelengths between 2.80-3.30nm, absorbed deep in the epidermis, initiates a chemical reaction. The amino acid tyrosine is converted to melanin. This gives the skin a bronzed appearance. The pigmentation acts as a filter and provides protection against further dosages of UV light.

Production of Vitamin D

Gives a general tonic effect

Effects of UVA Rays- Penetrate more deeply than UVB rays- cause destruction of collagen and elastin fibres in the dermis thus accelerating wrinkles and ageing.

Effects of UVB Rays- Responsible for main erythema production. Most damaging, burning rays.

Effected of UVC Rays- Most of UVC rays produced by the sun are absorbed by the atmosphere and do not reach the skin. UVC rays are described as biotic- harmful to living things.

The skin loses its natural ability to absorb and retain sufficient water causing superficial dehydration.

Decline in the cholesterol content of the skin- influences the amount of sub dermal fat and contributes to a withered look.

Regeneration of the epidermis is reduced and the skin looks thin.

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