“What are the treatment options for a nasal fungal infection?”

First, determine why the fungal infection occurred in the first place(which frequently is due to using NASAL STEROID INHALERS for chronic rhinitis/sinusitis, or due to some disorder that compromises the IMMUNE SYSTEM--like diabetes, leukermia, chemotherapy, chronic steroid therapy, chronic suppression of the immune system, etc)

Then, anti-fungal medication(like fluconazole, for example) needs to be taken for a few weeks to eliminate the fungal infection.

First you need to see an ENT for evaluation and testing. A sinus CT is mandatory. Surgery may be indicated. Also an internal medicine evaluation for immune disorders, diabetes, etc. A number of "azole" medications may be indicated. Possibly topical Nystatin. And frequent saline nasal irrigation

Is it in the sinus or just the external nares? Sometimes topical anti-fungals can be put on a Q-tip in the nose. If it's in the sinus, oral anti-fungals may be needed. Sometimes they have to be treated longer, 3-6 weeks.