Suggest Remedy For Black Patches On Lips

hi, I have black patches developed on my lips since past 2.5 years. earlier they were not that prominent, but now they look really ugly... I do not smoke and m not even addicted to beverages. I live a healthy lifestyle presently... In my fast few years i was really deprived of nutrition and i had also gone for an orthodontic treatment for my teeth 3 years back. Can I get my normal lips back? Please help... m really frustrated..want some quick remedy. Namrata Bangalore