Sounds abit silly, but banana skin works
Rub the inner side of the banana peel directly on the skin. Try to use the skin of a green banana, not a ripe one. Cut a piece of banana skin, and tape it over the affected area using elastoplast etc. Depending on what you are using it for, and who you speak to, some people leave it on for as long as a week, others change the peel as often as twice per day. Sometimes it may be more practical just to leave it taped on overnight