脇汗

1. Origins, structure, and basic meaning

• Structure: 脇汗 is read as わきあせ and is a noun for sweat from the underarm area.
• Basic usage: Use シャツに脇汗がにじむ when it shows through clothing and 脇汗が気になる when it is a concern.

2. Common pitfalls and similar expressions

• Sweat and visible mark
  • 脇汗 names the sweat itself; a mark on clothing is a result of that sweat seeping through.
• No single built-in cause
  • It can occur with heat, nervousness, or other situations, so the word itself does not specify one cause.