That stress can knock your immune system off the top of its game isn't shocking, but you may surprised to learn that undergoing emotional and mental stress can actually create physical reactions, including allergic reactions. Sometimes these reactions become severe, especially if they last more than one day.

Boils, also called risens and furuncles, are round, raised bumps on the skin filled with puss and caused by a Staphylococcus bacteria infection. Boils often develop around a hair follicle root, and often occur in children and adolescents, although adults can also get them.