Starts at the base of the nail and raises the nail up: This is called "proximal subungual onychomycosis." This is the least common type of fungal nail. It is similar to the distal type, but it starts at the cuticle (base of the nail) and slowly spreads toward the nail tip. This type almost always occurs in people with a damaged immune system. It is rare to see debris under the tip of the nail with this condition, unlike distal subungual onychomycosis. The most common cause is T. rubrum and non-dermatophyte molds.
Dermatophytes — fungus that grows on the skin, hair and nails but don’t penetrate tissues of the body. Athlete’s foot or Trichophyton rubrum is the most common dermatophyte and can actually infect the toenails. Infection can also begin by touching objects that have dermatophytes on them, such as nail clippers, nail files, socks, shoes, shower floors, etc. Dermatophytes are the cause of most fungal toenail infections.
Excellent product. It worked beyond expectations. When I bought it, I was trying to make up for the lack of an appoinment opening with my dermatologist. It took 2 weeks to be seen, so in the meantime, I applied it according to the recommended use. So when I went to my appointment, the doctor had to look at my before pictures. He told me I didn't have fungus. I had to convince him that I need prescription fungus medication. Super effective, beyond expectations.
Satchell, A. C., Saurajen, A., Bell, C., & Barnetson, R. StC. (2002, July 19). Treatment of interdigital tinea pedis with 25% and 50% tea tree oil solution: A randomized, placebo-controlled, blinded study [Abstract]. Australasian Journal of Dermatology, 43(3), 175–178. Retrieved from http://onlinelibrary.wiley.com/doi/10.1046/j.1440-0960.2002.00590.x/full