What Causes Pain, Swelling And Bleeding From The Lower Lip?

I am 70, and have recently (several times a year) awaken to a sore, bleeding, split or cracked and swollen lower lip. Sometimes exisisting for weeks, however can persist for a month or more. ALSO: I served as an infantry Commander in Vietnam in 1970 and 71 and saw an immense amount of Converse however I was just diagnosed 10 years ago with PTSD and the doctor prescribed lithium. approximately six months ago my face started becoming covered in the nose area the chin and cheek areas with small little blood vessels....Sorry emergency, had to RUN! Now back to our Story ; for the past two or three weeks they seem to be showing them sells faster and faster especially in the cheek area what is your recommendation for the irritants listed above? Thank You, RD