A nail that becomes thick, discoloured, painful or misshapen can be more than a cosmetic concern. Fungal infection is common, but eczema, psoriasis, injury, bacterial infection, medication, nutritional problems and, rarely, skin cancer can all affect the nails. A prompt clinical assessment helps avoid months of ineffective treatment and gives you a clear plan.
Why an accurate diagnosis comes first
Nails grow slowly. A fingernail can take around six months to grow out fully, while a toenail may take 12 to 18 months. This means damage or disease can remain visible long after the original trigger has resolved. It also means treatment needs patience, particularly for toenails.
The appearance of a nail alone does not always reveal the diagnosis. Yellow, thickened toenails are often assumed to be fungal, for example, but they can also result from repeated pressure in shoes, psoriasis or previous trauma. Starting antifungal medication without confirmation may expose you to unnecessary treatment and delay the care that would actually help.
A dermatology assessment considers the pattern of nail changes, your skin and scalp, medical history, medicines, occupation, sport and footwear. Where fungal infection is suspected, a nail clipping or scraping can be sent for laboratory testing. This is particularly useful before prescribing oral antifungal tablets.
Common nail disorders and their treatment options
Fungal nail infection
Fungal nail infection, also called onychomycosis, commonly affects toenails. The nail may become yellow or brown, thick, crumbly and difficult to cut. It can spread from athlete’s foot and is more likely with increasing age, diabetes, reduced circulation, immune suppression or frequent use of communal changing areas.
For mild disease affecting a small part of one or two nails, a medicated antifungal lacquer may be appropriate. These treatments require consistent use for many months and tend to work best when the infection is superficial.
When infection affects several nails, involves the nail base or causes significant thickening, oral antifungal tablets may offer a better chance of clearing it. The choice of tablet, treatment duration and any need for blood tests depend on your medical history and other medicines. Oral treatment is not suitable for everyone, including some people with liver disease or potential drug interactions.
Thick nails can also be reduced and carefully trimmed to improve comfort in shoes and help topical treatments reach the affected area. Treating athlete’s foot, keeping feet dry, changing socks regularly and avoiding shared footwear all reduce the chance of reinfection.
Nail psoriasis and eczema
Psoriasis can cause pitting, ridging, lifting of the nail from the nail bed, discolouration and thick debris beneath the nail. Eczema or contact dermatitis around the fingers may lead to brittle, split or irregular nails. These conditions are not infections, so antifungal treatment alone will not resolve them.
Treatment usually focuses on controlling inflammation in the surrounding skin and nail matrix, the area where the nail is formed. This may include prescribed topical steroid treatment, vitamin D-based creams, or treatment for psoriasis elsewhere on the body. More extensive psoriasis may require specialist systemic medication.
Nail psoriasis can be stubborn because medication must reach the correct part of the nail unit, and visible improvement follows the pace of nail growth. Protecting hands from repeated wet work, detergents and trauma is also worthwhile. Gloves with a cotton lining can help for cleaning tasks, but should not be worn for prolonged periods if hands become sweaty.
Trauma, lifting and brittle nails
A black or purple nail after dropping something on a toe, catching a finger or repetitive impact in sport may be due to bleeding beneath the nail. Small injuries often grow out without intervention. A larger, painful collection of blood beneath the nail may need urgent drainage, usually soon after the injury, to relieve pressure and reduce pain.
Repeated pressure from running shoes, tight footwear or manual work can cause nails to thicken, split or lift. The treatment is practical: assess footwear fit, reduce repetitive impact where possible and trim the nail straight across rather than digging into the corners. A podiatry assessment may be helpful for severely thickened or difficult-to-manage toenails.
Brittle nails may improve with reducing exposure to water, solvents and harsh nail products. Avoid aggressive buffing, frequent gel removal and cutting cuticles. A clinician may also consider whether iron deficiency, thyroid disease or another underlying issue is contributing, especially when brittle nails occur alongside fatigue, hair changes or other symptoms.
Bacterial infection around the nail
Pain, redness, warmth and swelling beside a nail can indicate paronychia, an infection of the nail fold. Acute infection may follow a torn cuticle, biting the nails, manicure injury or picking at the skin. Early cases may settle with warm soaks and protecting the area, but a collection of pus can require drainage. Antibiotics are sometimes needed, depending on the severity and spread of infection.
Long-standing inflammation around several nails is often linked to frequent wet work, irritants or yeast overgrowth rather than a simple acute bacterial infection. Treatment may involve avoiding triggers, keeping hands dry, using prescribed anti-inflammatory cream and addressing any infection identified on assessment.
Ingrown toenails
An ingrown toenail develops when the nail edge grows into the surrounding skin. It can cause pain when walking, redness, swelling and infection. Cutting down the side of the nail yourself often makes the problem worse.
Early cases may respond to footwear changes, careful nail care and treatment of inflammation. If the problem is recurrent or severely painful, a minor procedure under local anaesthetic can remove the offending nail edge. In some cases, the treated section is prevented from regrowing to give a more permanent solution.
When nail changes need urgent assessment
Most nail problems are treatable and not urgent, but certain changes should not be watched at home. Arrange prompt medical assessment if you notice a new dark brown or black line in one nail, especially if it widens, has irregular colour or pigment extends onto the surrounding skin. This can occasionally be a sign of melanoma beneath or around the nail.
You should also seek urgent advice for a painful finger or toe with spreading redness, pus, fever or red streaking; a nail injury with severe throbbing pain or obvious deformity; or a non-healing lesion, bleeding area or lump around the nail. People with diabetes, poor circulation or reduced immunity should seek advice early for any foot or nail infection.
Nail disorders: what are my treatment options after assessment?
Your treatment plan should match the diagnosis, the number of nails involved, the impact on comfort and function, and your wider health. For some people, reassurance, nail care and protection from trauma are enough. For others, laboratory-confirmed antifungal treatment, prescription anti-inflammatory treatment, drainage of infection or a minor nail procedure is more appropriate.
There are trade-offs. Topical treatments are generally low risk but demand persistence and may be less effective for advanced fungal infection. Oral medication can be more effective, but requires a review of medical history and possible monitoring. Procedures can provide quick relief for an ingrown or injured nail, but recovery and aftercare still matter.
At Clinic 360, patients can arrange rapid-access dermatology assessment without a GP referral. The aim is not simply to label a nail as “fungal”, but to identify the cause, explain the options clearly and organise appropriate treatment or onward care without unnecessary delay.
Bring a note of when the change began, any previous treatments, your regular medicines and photographs if the nail appearance has changed over time. A small detail, such as a new nail product, a change in footwear or a recent injury, can be the clue that leads to the right treatment and the confidence to move forward.