I assume plasta cheilitis is the same thing as plasma cell cheiltiis? It's a great find of a new term because it brings up more articles. This article states,
"Plasma cell cheilitis is a rare condition of having redness and swelling of the lips. The cause behind plasma cell cheilitis may be hypersensitivity reactions to some antigen like toothpastes, chewing gum, mints, pepper etc. It is seen that Preventing exposure to the causative antigen leads to remission." So, I wonder if this is triggered by an allergy in addition to the skin becoming infected with yeast.
It also mentions treatment for staph infections on the lips, which are fusidic acid, neomycin, mupirocin, metronidazole and chlorhexidine creams. I didn't know there was a chlorhexidine cream.