please read: http://www.ehow.com/facts_6150769_solar-cheilitis.html



when my ec first began i had been way overexposed to uv rays in the sun while using a non spf lip balm, which is like using tanning oil on your lips...

its very similar (or possibly the same as) actinic cheiltis

Symptoms:
Dry lips
Thinned skin of the lips
Scaly patches
Swelling of the lip
Redness and soreness
Ulceration and crusting
Loss of demarcation between the vermilion border of the lip and its adjacent skin
Prominent folds and lip lines
White thickened patches (leukokeratosis)
Discoloured skin with pale or yellow areas