My toenail is changing colour. What can be causing it?

The function of a toenail is protection of the tip of the toe. If we are lucky, we will progress through life with few changes to their appearance, but that isn’t always the case.

We all have a good idea of what we consider a ‘normal’ nail, but sometimes all or part of the nail can start to change colour. In this blog we look at how and why this can happen.

brown-black discolouration (occasionally red)

Although uncommon, the first condition to eliminate is (subungual – under the nail) melanoma. Speak to your podiatrist or GP if you are concerned. In reality, there are numerous benign causes.

Longitudinal melanonychia

This is a term used to describe a  strong and noticeable pigmented band – normally brown – that runs down the nail from the bed to the tip. This condition normally affects more than one nail at a time.

This is quite common in Black-skinned, Asian, Hispanic, and Middle Eastern individuals who frequently have benign/harmless longitudinal pigmented bands. This is due to the naturally occurring pigment cells or melanocytes that make their skin darker.

The number and width of the bands tend to increase with age.

However, the presence of a new, single – only occurring on one of ten nails –  dark coloured band in an adult could represent a melanoma and should be checked immediately.

There are additional uncommon causes including systemic disease and medication to numerous to list here.

Subungual haematoma (bruise)

Following trauma – kicking something, dropping something on the toe – blood can accumulate in the space between the nail bed and nail plate. It can  also happen following vigorous exercise/dancing when you don’t remember ‘bashing it’.

The discolouration is often accompanied by considerable pain due to the pressure created under the nail. If you visit a Podiatrist as soon as possible after the injury occurs, it is possible to painlessly drain the fluid and bring immediate relief.

Yellow/white discolouration (occasionally orange)

Onychomycosis (fungal nail)

Nail fungus usually cause a yellow-white discolouration, but occasionally it can be black or orange.

Nail fungus usually starts at the tip or sides of the nail and work their way upwards towards the nail bed frequently following trauma.It is very common for patients to report that fthe fungus appeared after damaging the nail.

If caught early, infected nail can sometimes be trimmed away to prevent spread.

If allowed to become established, treatment can be difficult and lengthy. For further information https://maidenheadpodiatry.co.uk/what-can-i-do-about-my-fungal-nail/

Some medications can also produce similar discolouration.

Cream, Dark yellow or white-yellow nails

Trauma

When nails have experienced trauma, the protective mechanism can be triggered, and they increase in thickness. That increase in thickness causes the colour of the nail to darken and take on a changed appearance. The nail will also grow more slowly.

Psoriasis

This condition can occur just on nails with no history or occurrence on the skin. The changes can be similar to, and are often mistaken for, a fungal nail infection and it is important to establish which you have, to allow appropriate treatment

Paronychia

Or infection of the nail bed. This can lead to a change in appearance as pus builds up under the nail. This condition can require release of the pus and prescription of anti-biotics, depending on severity.

Some medications can also produce similar discolouration.

Yellow Nail syndrome

This is a very rare condition characterised by very curved, transversely thickened, smooth, yellowed nails and is associated with lymphoedema, pleural effusion, and (usually) ascites.

White nail discolouration

Minor trauma

A common cause, and tends to produce small localized areas of whiteness, like white spots on the nail.

There are a number of other systemic conditions that can also lead to white nails but they are too uncommon and numerous to be listed here.

Green/blue nails

Pseudomonal nail infection

Pseudomonas infection is often found on the underside of a nail (it can also be found on the skin) which has already lifted, often due to trauma or previous infection. It is characterised by green-blue, or occasionally black, discolouration. This infection is relatively harmless in healthy adults. If you are immune compromised you should seek advice.

Some medications can also produce similar discolouration.

If you would like more information or to make an appointment with one of our Podiatrists, call 01628 773588 and speak to one of our friendly reception team.