Onychomycosis
Onychomycosis is a fungal infection of the fingernails or toenails. Affected nails typically turn yellow, white, or brown, thicken, and may crumble at the edges. Toenails are far more commonly affected than fingernails, and the condition tends to progress slowly if left untreated.
Medicines used to treat Onychomycosis
Why nails are vulnerable in tropical climates
Heat and humidity across Southeast and South Asia create ideal conditions for the dermatophyte fungi that cause most cases. Communal bathing areas, swimming pools, and prolonged footwear use in countries such as Thailand, Malaysia, Indonesia, and the Philippines all raise the risk. People with diabetes or reduced circulation in the feet are more susceptible, and prior athlete’s foot (tinea pedis) frequently spreads upward to the nails.
How onychomycosis is treated
Because nails grow slowly and form a physical barrier, oral antifungals penetrate more reliably than topical creams alone. Terbinafine is the most widely used first-line agent; it accumulates in nail tissue and continues working after a course ends. Griseofulvin is an older alternative that suits certain fungal species. Both belong to the broader antifungals group. Treatment courses typically run several months, reflecting nail regrowth time rather than drug potency.
If a nail becomes painful, develops an odour, or shows signs of spreading infection into surrounding skin, a clinician should assess it promptly.