Is ultra voilet - B is safe for lips.

I have been suffering from Exfoliative chelitus for 4 years, its a condition in which lip skin peel off in cycle. I visited numerous dermatologist and i have tried many steroid cream, non steroid immune suppression cream, moisturizer, lip balm etc .. Nothing is working and at the end doctor say you are exausted with treatment.  I was so frustrated . I was feeling hopeless . So i started to read research papers to cure exfoliative cheilitis on my own . I found a article in UVB laser are used for treatment of this disease. I told this to my dermatologist, she said you are not doctor , you have half knowledge .. i agree but she was not able to explain properly why UVB is bad. Most of the dermatologist, i took treatment, don't even educate their patients. So i need some information regarding UVB. Please post your answer , if i found answer useful then only i will contact the doctor