Medically reviewed by Deeptej Singh, MD Melanonychia, also known as a dark or black line on the nail, causes a streak of dark ...

Most of the time, thin, vertical black lines under your nails are no cause for concern. But if you've had them for a while or ...

This summer, Charmaine Sherlock noticed a thin black line under her nail of her left thumb — what looked like a splinter growing from her cuticle. She thought perhaps she was having an ...

In June, the Turner Prize-winner will curate ‘Connecting Thin Black Lines’ at the ICA, an exhibition that marks 40 years since ‘The Thin Black Line’, the landmark 1985 exhibition at the ...

A mysterious long black line pictured in the Kent sky has left both residents and experts puzzled. The dark vertical apparition was pictured in Folkestone yesterday morning by a woman who “could ...