I am 16 years old. Last year in the beginning of winter, I got a black dot on my lip. I went away a little later but recently I got it again. This time, its just not a dot, it has spread all over my lips. My whole lip is black. Like abnormally black. I got a skin test done and my doctor told me its a sponge allergy. I cant find anything online that's related to my condition. I want to know how long it will take to go away.