expression, noun
finger pad; ball of a finger
Refers to the fleshy, cushion-like part of the fingertip, opposite the nail. Used in everyday contexts like touchscreens, massage, or describing how to press something.
スマホの画面を指の腹でなぞる。
Trace the smartphone screen with the pad of your finger.
指の腹で優しくマッサージする。
Gently massage with the ball of your finger.