Nail Disease can often be a symptom of other skin conditions such as psoriasis, eczema and alopecia areata. In addition, an underlying internal condition can also be seen in the nails and might prompt further investigation (e.g. bulbous nails, known as clubbing, can result from disorders affecting the lungs, heart or liver).

Below is a list of commonly experienced nail problems:

Lifting of the Nail Plate (Onycholysis)

• This is usually due to a repeated minor injury to the underside of the nail. It appears white instead of pink due to air getting under the nail. Other causes for this can also be psoriasis, fungal nail infections (onychomycosis) or water immersion.

Pitting

• This describes individual depressions around the size of a pinhead. This condition is usually seen in psoriasis and other causes such as eczema and alopecia areata (hair loss).

Ridging

• Ridging This refers to either vertical (longitudinal) or horizontal (transverse) nail ‘ridges’. Longitudinal ridging commonly appears with age and can be associated with conditions such as lichen planus and repetitive nail injury. Transverse depressions usually appear after a significant illness or due to episodes of paronychia, which is often related with nail biting.  Furthermore, fiddling with nails or cuticles can also produce irregular ridging.

Thickening of Nail (Onychogryphosis)

• This is frequently seen in toenails, especially elderly people. Often this is a result from long term use of ill-fitting footwear and neglect of the nails. It may also be due to other medical conditions such as psoriasis or fungal infections.

Discolouration

• Yellow is commonly due to a fungal nail infection (oncychomycosis). However, nails affected by psoriasis may also appear yellow. Smoking can also leave the nails yellow in colour. In rare conditions ‘yellow nail syndrome’ can be seen and is due to an underlying disorder affecting the lungs and lymphatics.
• Green nails are usually due to a bacterial nail infection (pseudomonas) as well as infection due to a yeast called candida. Pseudomonas infection can often affect nails that have been damaged by a common fungal infection or trauma
• Brown colouring can be caused by medications, chemicals from hair dyes, nail varnish, nicotine, trauma, chemotherapy and antibiotics. In rare conditions, melanomas may present a brown or black pigmentation on or under the nail. It is of high importance to seek medical advice to rule out melanoma in the case of a single brown or black nail.
• White (leuconychia) nail colour may run in families or can be caused by any medical condition that results in low levels of protein in the blood.

Inflammation of the Nail Fold (Paronychia)

• Acute infection of the nail cuticle can cause redness, swelling, tenderness and pain, sometimes with pus formation. This is commonly a result of over-zealous manicuring or when nails are immersed in water for long periods of time. Occasionally, this condition can also be seen in infants who suck their thumbs.