Is the philtrum a common place to have a fungal infection?

Yeast?: For humans and most primates, the philtrum survives only as a vestigial medial depression between the nose and upper lip. If this area is moist from nasal discharge, or slightly abraded by use of tissues when sneezing, there is no reason why it cannot become secondarily yeast infected, but it is not common.

Not really: You could possibly get a fungal infection there, but a bacterial cause from a nasal vestibulitis is more common. Is it in the nostrils too? It could also be an allergic reaction to a topical medication, if you are using one. If it is in the nostrils too, topical Mupirocin or bactroban 2% ointment 2-3 times per day in the nostrils will help. I would see an ENT doctor or derm anyway.