nail bed

US /ˈneɪl bed/
UK /ˈneɪl bed/
"nail bed" picture
1.

lecho ungueal

the part of the finger or toe under the nail

:
She painted her nails, being careful not to get polish on her nail bed.
Se pintó las uñas, con cuidado de no manchar el lecho ungueal.
A healthy nail bed is usually pink.
Un lecho ungueal sano suele ser rosado.