What are UVA and UVB rays?

The sun can damage your lips and leave them dry and sore. When its rays reach the earth, the ultraviolet (UV) light divides into two frequencies: A and B.

UVA rays penetrate deep into the skin and are responsible for accelerated ageing when exposure is for extended periods. The rays reach earth at a constant rate all year round and can penetrate dense clouds, light clothing and untinted glasses.

UVB rays are responsible for sunburn and ultimately can cause skin cancer. These rays reach the earth at a greater rate and intensity during the summer months, although clouds, clothing and UV protective glasses can block them.

Sunlight is one of the most damaging factors the body encounters and lips are particularly vulnerable. Skin has a certain amount of natural protection in the form of melanin: light-reactive pigments that absorb UV rays and darken (tan) in response to exposure. Lips, however, have almost no protective melanin of their own.