<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing lip swelling lately, and I have noticed that my skin is becoming thin and fragile. What could be the problem?  <response>: It appears that you might be suffering from an atrophic skin condition called Erosive Oral Lichen Planus which causes lip swelling along with thinning of the oral mucosa. I suggest you see a dermatologist for further evaluation and treatment. 