Unfortunately, I couldn't find any specific pathogens that are associated with facial SD yet. Charlene from dnafreqs wasn't really helpful either. No one is concerned.
But since I have changed my diet to high-fat(saturated)/protein, I have been seeing some positive changes in my skin. Also basic butter and beef dripping (lard) used on the SD spots continuously for a few days have made a change and reduced my facial SD significantly.