How did a few vesicles grow on the body to return a responsibility

Blisters may be caused by allergic factors, such as severe acute eczema, which may show scattered, symmetrical or generalized pin-sized blisters locally, which may be accompanied by itching and obvious exudation after scratching, forming erosive surfaces. Blisters may also be caused by insect bites, which are caused by the body's allergic reaction to foreign antigens secreted by insect bites.