top of the shoulder; shoulder tip; collar area
Refers to the area where the shoulder meets the neck or the upper edge of the shoulder. Often used in contexts like clothing (collar), massage, or describing where something rests.
See also: 肩先
It feels good to have the top of my shoulders massaged.
She held the baby against her shoulder.
Compound of 肩 (かた, 'shoulder') and 口 (くち, 'mouth, opening'), referring to the 'opening' or edge of the shoulder area.