Your feet carry you through busy days, workouts and long commutes. Most of the time, they only get attention when something hurts.
But health experts say your toenails can sometimes reveal far more than cosmetic issues.
Dermatologists are warning that certain nail changes may point to a rare yet serious form of skin cancer that often goes unnoticed.
A cancer beyond sun exposure
Melanoma is considered the deadliest type of skin cancer. The American Academy of Dermatology Association reports that one in five Americans will develop skin cancer in their lifetime.
Also read: Health officials raise concerns after spike in London measles cases
While it is commonly linked to ultraviolet radiation, not every melanoma is caused by sun damage.
A lesser-known subtype called subungual melanoma forms beneath or around the nail.
According to the Cleveland Clinic, this variant is uncommon but potentially aggressive and is not associated with UV exposure. It most frequently appears on the big toe, thumb or index finger.
Medical data show it is more often diagnosed in adults between 50 and 70 years old and occurs at higher rates among African-American, Asian and Hispanic populations.
Also read: Research explores links between gum disease, dementia and colorectal cancer
Subtle but serious signs
Because it develops under the nail, it is often mistaken for bruising or infection. Specialists highlight several warning signals:
- A dark brown or black streak running vertically along the nail
- Pigment spreading onto nearby skin
- The nail lifting away from the nail bed
- A split forming down the centre
- A new lump or irregular band of colour
Doctors recommend prompt evaluation if a new dark stripe appears without injury.
Early action is key
Like other melanomas, this cancer can spread if untreated. Regular self-checks and early consultation with a dermatologist improve the chances of successful treatment.
Also read: Increase your B vitamins without supplements
Also read: Doctor shares method to fall back asleep after waking at 3am