sweat drops are a common visual convention. characters are drawn with one or more prominent beads of sweat on their brow or forehead (or floating above the hair on characters whose back is turned). this represents a broad spectrum of emotions, including embarrassment, exasperation, confusion, dismay and shock, not all of which are necessarily considered to be sweat-inducing under normal conditions. actual physical perspiration in manga is signified by even distribution of sweat drops over the body, occasionally on top of clothing or hair.