Fungal infection of nails (tinea unguium) is common, particularly in toenails in the elderly. The infection causes thickened and unsightly nails which sometimes become painful. Medication often works well to clear the infection but you need to take medication for several weeks.
Who develops fungal nail infection?
Between 3 and 8 out of 100 people in the UK will have a fungal nail infection (tinea unguium) at some stage of their lives. Toenails are more commonly affected than fingernails. It is more common in people aged over 60 and in younger people who share communal showers, such as swimmers or athletes.
What causes fungal nail infections?
- Spread from a fungal skin infection. For example, athlete's foot (tinea pedis) is a fungal skin infection of the toes. This may spread to the toenails if the skin infection is not treated early. See the separate leaflet called Athlete's Foot (Tinea Pedis).
- Fingernail infection may occur after a toenail infection has become established. The fungus may spread to a finger if you scratch your itchy toes and toenail.
- Fingernail infections are also more likely to occur if you wash your hands frequently, or have them in water a lot. For example, if you are a cook, a cleaner or a hairdresser. Constant washing may damage the protective skin at the base of the nail. This may allow fungi to enter.
- A nail that has recently been damaged is also more likely to become infected.
- You have an increased risk of developing a fungal nail infection if you have various other conditions - for example:
- Poor circulation.
- A poor immune system (for example, if you have AIDS or are on chemotherapy).
- A general poor state of health such as heavy alcohol consumption.
- Nail infections are more common in people who live in hot or humid climates.
- Smoking also increases the risk of developing a nail infection.
- In some cases there is no apparent reason. Fungal germs are common and an infection can occur 'out of the blue'.
Fungal nail infection symptoms
Often the infection is just in one nail but several may be affected. It is usually painless. The nail may look thickened and discoloured (often a greeny-yellow colour). Commonly, this is all that occurs and it often causes no other symptoms. The main reason people see their doctor is because the appearance is unsightly.
Sometimes the infection becomes worse. White or yellow patches may appear where the nail has come away from the skin under the nail (the nail bed). Sometimes the whole nail comes away. The nail may become soft and crumble. Bits of nail may fall off. The skin next to the nail may be inflamed or scaly. If left untreated, the infection may eventually destroy the nail and the nail bed, and may become painful. Walking may become uncomfortable if a toenail is affected.
This photo shows the typical appearance of fungal infection of the toenails:
Image source: Open-i (Yue X et al) - see Further reading reference below
This photo shows fungal infection of the fingernails, which is less common than fungal infection of the toenails:
Image source: Open-i (Noronha TM et al) - see further reading reference below
Do I need any tests?
Other nail conditions can sometimes look like a fungal infection. Therefore, to confirm the diagnosis, a doctor will usually take a nail clipping and send it to the laboratory for testing.
Fungal nail infection treatment
This is an option if the infection is mild or causing no symptoms. For example, a single small toenail may be infected and remain painless and of little concern. Some people may prefer not to take treatment because:
- Treatment does not always cure the infection. Cure rates are about 60-80%.
- Treatment that clears the infection does not always restore the nail's appearance to normal.
- The antifungal medicines used for treatment need to be taken for several months - sometimes longer.
- Although rare, unpleasant side-effects sometimes occur with antifungal medicines.
The option to treat can be reviewed at a later date if the infection becomes worse or if you change your mind.
However, treatment is usually advised if:
- Symptoms are troublesome. For example, if walking is uncomfortable due to an affected nail.
- Abnormal-looking nails cause distress.
- You have diabetes, vascular disease or a connective tissue disorder (because of a higher risk for secondary bacterial infections and cellulitis).
- The nail infection is thought to be the source of a fungal skin infection on your body.
- You have, or are likely to develop, severe problems with your immune system. For example, if you are to have certain types of cancer treatment in the future.
Antifungal tablets will often clear a fungal nail infection. The medication will also clear any associated fungal skin infection, such as athlete's foot (tinea pedis). Your doctor will usually recommend one of the following two medicines. The one chosen may depend on the type of fungus causing the infection. Both of these medicines cause side-effects in a small number of people, so read the packet that comes with the medicine for a full list of cautions and possible side-effects.
- Terbinafine tablets. The usual adult dose is 250 mg once a day; for between six weeks and three months for fingernails, and for three to six months for toenails. Visible improvement should be expected after a month of treatment, although treatment will then need to be completed for the recommended duration.
- Itraconazole tablets. This is usually given as pulsed treatment. That is, for an adult: 200 mg twice a day for one week, with subsequent courses repeated after a further 21 days. Fingernail infections require two pulsed courses and toenail infections require at least three pulsed courses.
Studies suggest that in about 5 in 10 cases the nail will look fully normal again after treatment. In about a further 2 in 10 cases the fungus will be cleared from the nail after treatment but the nail does not look fully normal again. Fingernails tend to respond better to treatment than toenails do. One reason for treatment to fail is because some people stop their medication too early.
If there is no improvement in your nails after a month of treatment, the diagnosis may be wrong: your nails could be disfigured for other reasons, such as psoriasis or nail trauma.
Antifungal nail paint (nail lacquer)
A nail lacquer that contains the antifungal medicine amorolfine is an alternative for most (but not all) types of fungi that infect nails. You can buy amorolfine nail lacquer from pharmacies as well as obtaining it on prescription. However, this tends not to work as well as medication taken by mouth. Your doctor will advise if it is a suitable option for your type of infection. For example, it may be useful if the infection is just towards the end of the nail. This treatment does not tend to work so well if the infection is near the skin, or involves the skin around the nail.
The nail lacquer has to be put on exactly as prescribed for the best chance of success. You may need six months of nail lacquer treatment for fingernails and up to a year for toenails: this can work out very expensive and so it is worth seeing your doctor if you do not see any improvement after a month or two of amorolfine.
Tioconazole is another solution that can be applied to the nail. It is available on prescription, although research trials suggest it does not work as well as amorolfine.
If other treatments have failed, an option is to have the nail removed by a small operation done under local anaesthetic. This is combined with treatment with antifungal medication.
Research is looking at newer methods of treating fungal nail infections. These include laser treatment and ultrasound. Initial results are positive but more evidence is needed about the long-term results of the treatments.
What to look out for with treatment
The fungi that are killed with treatment remain in the nail until the nail grows out. Fresh, healthy nail growing from the base of the nail is a sign that treatment is working. After you finish a course of treatment, it will take several months for the old infected part of the nail to grow out and be clipped off. The non-infected fresh new nail continues growing forward. When it reaches the end of the finger or toe, the nail will often look normal again.
Fingernails grow faster than toenails, so it may appear they are quicker to get back to normal. It may take up to a year after starting treatment before toenails look completely normal again and six months for fingernails to look completely normal.
Consult a doctor if there does not seem to be any healthy new nail beginning to grow after a few weeks of treatment. However, the infection can still respond to treatment even after you finish a course of medication. This is because the antifungal medication stays in the nail for about nine months after you stop taking medication.
What can I do to help?
Take medication as directed and do not give up without discussing this with a doctor.
Side-effects are uncommon with modern medication but tell a doctor if you notice any problems with treatment.
Tips on nail care if you have a nail infection, with or without taking medication, include the following:
- Keep your nails cut short and file down any thickened nail.
- Use a separate pair of scissors to cut the infected nail(s) to prevent contaminating the other nails. Do not share nail scissors with anyone else (for the same reason).
- Avoid injury and irritants to your nails. For example, if fingers are affected, use cotton and vinyl gloves for wet work. Use heavy cotton gloves for dry work.
- If toenails are affected, wear properly fitted shoes with a wide toe box.
- Keep your feet cool and dry as much as possible.
Preventing fungal nail infection
Studies suggest that in about 1 in 4 cases where the fungal nail infection (tinea unguium) has been cleared from the nail, the infection returns within three years. One way to help prevent a further bout of nail infection is to treat athlete's foot (tinea pedis) as early as possible to stop the infection spreading to the nail. Athlete's foot is common and may recur from time to time. It is easy to treat with an antifungal cream which you can buy from pharmacies, or obtain on prescription. The first sign of athlete's foot is itchy and scaling skin between the toes. See the separate leaflet called Athlete's Foot (Tinea Pedis) for more details. Also:
- Try to avoid injury to nails, which may increase the risk of developing a nail infection.
- Wear footwear such as flip-flops in public places, such as communal bathing/shower places, locker rooms, etc.
- Avoid towel sharing.
- Consider replacing old footwear, as this could be contaminated with fungal spores.
Further reading and references
; British Association of Dermatologists
; NICE CKS, March 2018 (UK access only)
; The role of topical antifungal therapy for onychomycosis and the emergence of newer agents. J Clin Aesthet Dermatol. 2014 Jul7(7):10-8.
; An ultrastructural study of Trichophyton rubrum induced onychomycosis. BMC Infect Dis. 2015 Nov 1715:532. doi: 10.1186/s12879-015-1240-1.
; Clinico-microbiological study of dermatophytosis in a tertiary-care hospital in North Karnataka. Indian Dermatol Online J. 2016 Jul-Aug7(4):264-71. doi: 10.4103/2229-5178.185488.
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