指先

1. Origins, structure, and basic meaning

• Structure: 指先（ゆびさき） combines 指, finger, with 先, tip or end.
• Basic usage: Use it for fingertips numbed by cold or the part used to feel fine surface details.

2. Common pitfalls and similar expressions

• A finger versus its tip
  • 指 refers to a finger; 指先 refers to its tip. When lightly feeling a surface, the focus is on sensation at the fingertips.