My father noticed some mucosal changing in his mouth since last year, i.e., blister filled with water used to occur ....he was in habbit of helding Tobacco. Although there was no eruthroplakia and luekoplakia in the place where he used to keep Tobcco. And after noticing he also stopped his habbit...but it's 10 months and no relief. We visited many doctors , they are saying it's just because of dental miss arrangement. One doctor said no need to worry it's lichen planus. But now there is discoloration of skin . Eating spicy food is too difficult for him. Kindly help us out we are in lots.of fear..is this melanoma?