Multiple issue. Of the pneumonia?

I posted earlier for hyperpigmentation (after dental checkup they said its due to physiological reasons) and nothing to worry about. But i have observed first redness comes up then after that slowly in some they brownish patch forms up, no pain, only that area feels sour to taste. In my right buccal mucosa, it was there now its happening in left too. Apart from this i have found K. Pneumonia bacteria heavy growth in my sputum, and esionophils are high too and after doing a pft it showed early small airway obstruction but reversibility is there. Why can be the pigmentation occuring? Is it because of the pneumonia? Attached the image(left and right), and btw that lower wisdom tooth is there since 2-3 years so I don't think that is causing the problem..