The sunny weather and recent heatwave has us all reaching for our favourite summer dresses, but nothing can ruin your day quite like getting the dreaded thigh chafe that comes from hot weather and too much friction.Thigh chafe happens when you have repeated friction from walking or running, particularly when the heat causes you to sweat more, creating more friction and rubbing. It can happen to anyone, and most commonly occurs on your inner thighs during the summer, although it can also appear on your underarms and under your bust from repeated movement.