Fungal question?

I have a long history of varied dermatological problems (psoriasis and the like).  I currently have a rather strange problem.  I have what appears to be a fungus which is deposited on the pubic hairs on my scrotum.  It is white to light tan and appears at first glance to be a thickened hair.  Upon further examination, the coating will come of the hairs.  There is a smell associated with the substance, but I can't really describe it.  There is no redness, swelling, scaling of the skin. etc.  There is no problem with any other parts of my genitals (discharge, etc.)  If you could advise with any possible diagnoses before I go and see my doctor, I would appreciate it.  I don't like going to the doctor with mystery problems.

[Dr_Aparna]

Hi,
Piedra refers to fungal infection of the hair shaft. It is caused by colonization of the hair shaft that results in firm, irregular nodules.

If the nodule is dark, the infection is Black Piedra . These nodules will be firmly adherent to the shaft and cannot be readily detached.
If the nodule is white, the infection is White Piedra.  They are easily detached from the hair shaft by rubbing along its length. The color varies from white to light brown. Pubic hair, beard and mustache are the most commonly infected areas.

The source of infection is unknown and even though person to person transmission has been suggested, it rarely occurs. Therapy includes shaving of affected areas or topical application of salycylic acid, 2% formaldehyde or azole creams. Oral therapy with either ketoconazole or terbinafine has also been used.

ref:http://www.doctorfungus.org/mycoses/human/other/Piedra.htm