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What causes nail discolouration?
Yellow or brown discolouration is most commonly caused by fungal infection (onychomycosis), but can also result from psoriasis, frequent use of nail varnish, smoking, or rarely subungual melanoma. White patches or bands can indicate trauma, nutritional deficiency, or systemic illness. Accurate diagnosis determines the right treatment.
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What is nail psoriasis?
Nail psoriasis affects up to 50% of people with skin psoriasis and can occur in isolation. It causes pitting (small dents in the nail surface), onycholysis (nail lifting from the nail bed), thickening, and discolouration. It can be effectively managed with topical treatments, steroid injections, or systemic therapy for more severe cases.
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Are brittle nails a sign of something serious?
Brittle nails are very common and are often caused by repeated wetting and drying, frequent use of nail polish remover, or ageing. However, they can also be associated with iron deficiency, hypothyroidism, or other nutritional deficiencies. If brittle nails are accompanied by other symptoms, blood tests may be advisable.
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Can a nail disorder be a sign of skin cancer?
Rarely, a dark streak running the length of a nail (melanonychia) can indicate subungual melanoma — a form of melanoma beneath the nail. Any pigmented nail streak — particularly if new, widening, or associated with pigmentation of the surrounding skin — should be assessed by a dermatologist without delay.
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How long does it take for nails to improve after treatment?
Nails grow approximately 3–4mm per month for fingernails and slightly slower for toenails. This means visible improvement following treatment takes months — typically 3–6 months for fingernails and up to 12 months for toenails. Treatment must be continued for the full prescribed course to achieve clearance.
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Can I wear nail polish during treatment?
Nail polish is generally not recommended during treatment for nail infections or inflammatory conditions, as it can trap moisture and obscure monitoring of the nail during recovery. Your dermatologist will advise based on your specific treatment plan.
Your Patient Journey
1. Your
Consultation
Your dermatologist will examine the affected nails closely — including with a dermatoscope — and take a history covering onset, any associated skin conditions such as psoriasis or eczema, systemic health, and medications. Nail clippings may be taken for laboratory analysis. A diagnosis is reached and treatment options are discussed.