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.
Technically called “onychomycosis”, fungal infection of the nail plate (the hard outer nail) or nail bed (that lies under the hard nail) will most often appear as yellowish, white, black or green discolouration of the nail. The infected nail may also appear thickened or brittle. In severe cases, from long-term infection (where all the tissues of the nail have been infected), the infected nail may break up and fall off.
Removal of the nail can reduce symptoms rapidly, but regrowth of the nail can take one year during which time local treatment for fungus can be used. Oral medications include terbinafine (Lamisil), itraconazole (Sporanox), and griseofulvin (Fulvicin). Treatment regimens vary and can last between six weeks and one year. Side effects of systemic treatment include gastrointestinal disorders, liver toxicity, skin rash and other hypersensitivities. These medications should not be taken during pregnancy or if there is a chance you will become pregnant because of effects on the fetus.
Multiple fungi species can infect the nail. Fungus grows well in warm, moist environments such as showers. Fungus infection is one of the few foot problems that affect more men than women, perhaps because more men walk barefoot in locker rooms. Age is a factor, too. Half the sufferers are people older than 70. Other risk factors include having certain medical conditions such as diabetes, vascular insufficiency and malnutrition.
If common remedies do not offer relief within three to four months of consistent use, or if the discomfort worsens, contact your doctor. Extreme infections may require the temporary surgical removal of the nail. A replacement nail will usually grow. As the new nail regrows, it is good practice to treat it with an antifungal cream to prevent reinfection.
Before buying new shoes, have a professional measure the length and width of your feet at the end of the day, while you're standing. For unusually flat feet or high arches, an exam by a podiatrist may be warranted. These conditions can increase the risk of osteoarthritis. Early treatment and use of proper footwear may help to avoid unnecessary wear and tear on the joints of the foot.
Brittle (crumbly) nails and a whitish-yellowish or brownish discoloration are typical signs of nail fungus. The nails may also become thicker and change shape. The affected part of the nail sometimes detaches from the nail bed. The treatment options for nail fungus include nail polishes and creams as well as tablets. Nail polishes and creams are available in pharmacies without a prescription.
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.