Hello doctor, I m having trouble with my lips. Sometimes, I feel severe burning sensation, and numbness on my lips. It s more focal lessions kind as they are not all over the lips. After numbness, the lip skin where the sensation was felt becomes like a small blister that we get when we burn with hot water or oil. Then after few days, it becomes severely dry and dark. Sometimes it causes cuts in the corners of my lips which is very painful. I m applying bermouvate ointment but it reoccurs frequently. Please advise what is it.