Use tea tree oil. Tea tree oil is a natural anti-fungal. One study showed that tea tree oil may be effective for nail fungus. 18% of patients who used tea tree oil twice daily for 24 weeks were cleared of the infection.[13] To treat nail fungus with tea tree oil, use a 100% solution because lower concentrations have not been proven to be effective for this particular infection.[14]
Rotate your shoes – Change your shoes often. Even though you may have that favorite pair that you like to wear all the time, it is better for your feet to switch up your shoes from time to time. Even wearing the same pair of shoes two days in a row can elevate your risk for toenail fungus. Place shoes that you are not wearing in an area where they will get plenty of air.
Wei, Y.-X., Xu, X.-Y., Xu, & Song, X. (2017). A review of antifungal natural products against the pathogenic fungi causing athletes' foot disease. Current Organic Chemistry, 21, 1–13. Retrieved from https://www.researchgate.net/profile/Xun_Song/publication/319128408_A_Review_of_Antifungal_Natural_Products_Against_the_Pathogenic_Fungi_Causing_Athletes'_Foot_Disease/links/59931c65458515c0ce61efa1/A-Review-of-Antifungal-Natural-Products-Against-the-Pathogenic-Fungi-Causing-Athletes-Foot-Disease.pdf
I can tell you my own mother struggled with toenail fungus on her big toe for over 10 years, and the reason why she originally got it and then continued to struggle with this fungus was the chemotherapy she went through when diagnosed with breast cancer years ago. After going through chemo, she had systemic yeast and candida issues and then developed the toenail fungus. The exact treatment I detail below is what we used with her to successfully erase her fungus.
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

Scratching infected areas may also spread the fungus to the fingers and under the fingernails. If not washed away soon enough, it can infect the fingers and fingernails, growing in the skin and in the nails (not just underneath). After scratching, it can be spread to wherever the person touches, including other parts of the body and to one's environment. Scratching also causes infected skin scales to fall off into one's environment, leading to further possible spread.
Toenail fungus often begins as an infection in the skin called tinea pedis (also known as athlete’s foot). The fungus often starts under the nail fold at the end of the nail. Over time, it grows underneath the nail and causes changes to its appearance, such as a yellow or brownish discoloration. It can also cause thickening and deformity of the toenail. 
Athlete’s foot appears as a scaly red rash on the bottoms or sides of the feet often accompanied by itching, dry or cracked skin, stinging, and odor. You can also have moist, raw skin between your toes. Though athlete’s foot is fairly easy to treat with over-the-counter anti-fungal creams or sprays, this foot fungus is quite contagious and may easily spread to your toenails.
Toenail injury: There are two types of injuries that can occur to your toenail. The first is acute trauma where the nail is impacted over and over again as in the case of a runner wearing shoes that don’t fit well. The other thing that can happen is blunt trauma where something falls on your toe such as a heavy object and causes an injury. This injury makes your toenail more susceptible to fungus. It is important in both cases to look after your toenails properly to avoid an infection.

The US Food and Drug Administration (FDA) has approved several medicines as topical applications to help treat foot and toenail fungus and prevent the fungus from recurring. PROFOOT anti-fungal products containing Tolnaftate 1% are clinically proven to cure and prevent fungal infections on skin around, adjacent to, and under nails, making it easy to treat fungal infections all day, every day, until they have cleared. ProClearz Fungal Shield is a safe and effective clear formula that dries quickly with no unpleasant odor. The 1 oz. bottle comes with a brush-on applicator designed to reach skin areas around and under nails.
Trim infected nails. Using large toenail clippers and/or nail nippers, keep your toenails well-trimmed by cutting them straight across to the toe line. Thin thickened nails by gently scraping away the crumbly debris under the nail with a file. This will get rid of some fungus and help reduce pain by alleviating pressure on the nail bed and toes. Soak your toes first to soften the nails or trim after a shower.

Topical antifungal agents can be used but are often ineffective. Oral terbinafine is considered to be the first-line treatment for confirmed onychomycosis; the treatment course is generally 6 weeks for fingernails and 12 weeks for toenails.9 Azoles can also be used. Surgical debridement or removal of the affected nail is also a consideration for cases that are resistant to antifungals, and laser treatments for onychomycosis appear to be a promising area for future study.10


Toe infections sound scary, but they’re infections of the nails, most commonly caused by ingrown toenails. The toenail grows into the side of the toe, into the soft tissue there, and the skin begins to grow over it. It can get infected very quickly and is most commonly seen in big toes. This condition is painful, and an infection can be a serious problem.

Treatment: Nail fungus is a difficult condition to properly treat due to the average time before seeing results and the general lack of understanding regarding topical treatments. Fungus grows underneath the nail bed, making it extremely difficult to target. Certain nail fungus products, like topical ointments, contain nail penetrating ingredients that treat fungal nail infections underneath the nail bed where it grows.
Trim infected nails. Using large toenail clippers and/or nail nippers, keep your toenails well-trimmed by cutting them straight across to the toe line. Thin thickened nails by gently scraping away the crumbly debris under the nail with a file. This will get rid of some fungus and help reduce pain by alleviating pressure on the nail bed and toes. Soak your toes first to soften the nails or trim after a shower.

Wei, Y.-X., Xu, X.-Y., Xu, & Song, X. (2017). A review of antifungal natural products against the pathogenic fungi causing athletes' foot disease. Current Organic Chemistry, 21, 1–13. Retrieved from https://www.researchgate.net/profile/Xun_Song/publication/319128408_A_Review_of_Antifungal_Natural_Products_Against_the_Pathogenic_Fungi_Causing_Athletes'_Foot_Disease/links/59931c65458515c0ce61efa1/A-Review-of-Antifungal-Natural-Products-Against-the-Pathogenic-Fungi-Causing-Athletes-Foot-Disease.pdf

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