I like your explanation because I became il after a black gnat infestation. Dry shiny, oily black. I have gone over in my mind many times over the last almost four years events, exposures, environment, viruses or bacterial infections I have been sick with, things I have eaten and places I go. It always, without fail, comes back to shiny, very black gnats. They hunted me down inside the house or out. They covered the surface of my pool like an oil slick. They bit me and left holes in my skin. They went up my nose, in my eyes and down my ears. I tore out 2,000 sq. Ft of infested carpeting piece by piece. I pulled off baseboard, vacuumed, sprayed bug poison and sealed the baseboard back o the wall. I regrouted and resealed tile, flooring and around the fireplace. I pulled down drapery and installed wood blinds. I hired a duct cleaner for the a/c and heating ducts. I repaired foundation cracks and repaired stucco along the foundation of my home. I bought a new mattress and furniture. I do all the procedures mentioned on this website. I have even vacuumed my head numerous times which probably is not a good thing to do. The canister was full of eggs and debri from my poor bald head. Yet it continues to be under my scalp. I think once I became a host and they cycled through their stages successfully, it might just be too late to cause them to leave me. I can't even find anything that kills them. I have tried everything. Food products to poisons. Sprays, salts, D.E., vitamin C powder and even Coca Cola, paint thinner, gasoline, on the specimen, not on my head. NOT ON MY HEAD OR SKIN.. Any ideas?