when lips become very dehydrated"lack of oil gland and thin striatum cornium",epithelial cells produce keratin to make striatum cornium thick to reduce water loss,,,very simple.
guys,i cured my lips by only eating and drinking more,,and i saw all the images in the image galery and i think that they are all normal except for allesome11 and for that i want to ask allesome if he put any thing that turns his lips yellow or they just turn by themselfs.