If you observe any abnormal nail changes it is important to visit your doctor for prompt assessment. In addition to being cosmetically unappealing, OM can also lead to more serious complications, including the possible loss of your nail, bacterial infections, or cellulitis. Speak with your healthcare provider to determine what the best treatment plan is for you.

Ringworm, also called tinea corporis, is not a worm, but a fungal infection of the skin. It can appear anywhere on the body and it looks like a circular, red, flat sore. It is often accompanied by scaly skin. The outer part of the sore can be raised while the skin in the middle appears normal. Ringworm can be unsightly, but it is usually not a serious condition.

^ Jump up to: a b American Academy of Dermatology (February 2013), "Five Things Physicians and Patients Should Question", Choosing Wisely: an initiative of the ABIM Foundation, American Academy of Dermatology, retrieved 5 December 2013. Which cites:*Roberts DT, Taylor WD, Boyle J (2003). "Guidelines for treatment of onychomycosis" (PDF). The British Journal of Dermatology. 148 (3): 402–410. doi:10.1046/j.1365-2133.2003.05242.x. PMID 12653730.
Oral antifungal therapy has a high cure rate, depending on the medication. It can take nine to 12 months to see if it has worked or not, because that is how long it takes for the nail to grow out. Even when therapy works, the fungus may come back. Currently, an oral antifungal therapy is considered the best treatment for toenail fungus because of higher cure rates and shorter treatment duration compared to topical therapy.
Besides being exposed to any of the modes of transmission presented above, there are additional risk factors that increase one's chance of contracting athlete's foot. Persons who have had athlete's foot before are more likely to become infected than those who have not. Adults are more likely to catch athlete's foot than children. Men have a higher chance of getting athlete's foot than women.[25] People with diabetes or weakened immune systems[25] are more susceptible to the disease. HIV/AIDS hampers the immune system and increases the risk of acquiring athlete's foot. Hyperhidrosis (abnormally increased sweating) increases the risk of infection and makes treatment more difficult.[26]

For some people, a fungal infection of the nails can be difficult to cure and the first round of medication might not work. The nail infection can’t be considered cured until a new nail that’s free from infection has grown in. Although this indicates that the nail is no longer infected, it’s possible for the fungal infection to return. In severe cases, there may be permanent damage to your nail, and it may have to be removed.
Ringworm of the beard, or tinea barbae, is similar to ringworm of the scalp in that the fungus infects both the skin and the hair follicle. The most common type of tinea barbae is an infection deep in the skin that causes very red nodules on the face with pus that drains and tunnels through the skin to other areas close to the nodules. A less common type of tinea barbae is a mild infection on the surface of the skin.
Many podiatrists now consider this an effective treatment, but because it’s new, there’s not enough concrete data to compare with other treatments. Dr. Hinkes raises another concern: “A clinical cure and a mycological cure are two different things. With the clinical cure, you look at the nail and it looks fine. It’s pink and shiny and smooth and it looks great. But if you sample the nail, you might find that there’s mold or fungus there, so it does not have what we call a mycological cure—mycology is the study of fungi.

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

If you have diabetes, you may have reduced blood circulation and nerve supply in your feet. You're also at greater risk of a bacterial skin infection (cellulitis). So any relatively minor injury to your feet — including a nail fungal infection — can lead to a more serious complication. See your doctor if you have diabetes and think you're developing nail fungus.
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