Infections
Nail Fungus (Onychomycosis)
Nail fungus causes thick, discoloured, crumbly nails, usually on the toes. Dermatologists confirm it with a KOH test or culture and treat it with oral antifungals, medicated nail lacquers or nail fungus laser.
Overview
Not every discoloured nail is fungal; psoriasis and trauma look similar. Testing before treatment avoids months of the wrong therapy.
At a glance
Diagnosis
KOH microscopy or fungal culture.
Treatment options
Oral terbinafine or itraconazole, efinaconazole solution, laser.
Timeline
Toenails take 12 to 18 months to grow out clear.
Frequently asked questions
Does nail fungus laser work?
It can help, often combined with medication.
Are oral antifungals safe?
Dermatologists check suitability and may monitor liver tests.
Can it come back?
Yes; keep feet dry and treat athlete's foot.
Related
Choose a specialist
See a board-certified dermatologist, not just a “skin clinic”
In Korea, only about 1 in 10 clinics that treat skin is run by a dermatology specialist (피부과 전문의). Specialists complete a four-year dermatology residency and a national exam. Our directory lists only clinics in the Association of Korean Dermatologists’ specialist search. This page is general information, not medical advice.