A place where beauty treatments such as hairdressing, makeup, and skincare are provided. Similar to 美容院 and 美容室, but 美容所 is less common in everyday speech.
See also: 美容院 (びよういん) · 美容室 (びようしつ)
A new beauty salon opened in front of the station.
美容室 is also common and interchangeable with 美容院 in many contexts. 美容所 is less frequent and may sound slightly more institutional.
Compound of 美容 (beauty) and 所 (place). The exact historical derivation is uncertain, but the word follows a standard pattern for naming establishments.