I am 28 years and I have angular cheilitis from last couple of years, I have consulted couple of doctors and they suggested below medication 1. Vitamin b tablets2. Fusys dt 50event if I take this medication it will get healed for couple of day but after that it came back, my diet is very normal and I took care of vitamin b reach food. Due to this corner of my lips become black in shade and that gets dry too according to weather conditions.