As the largest organ in the body, your skin serves numerous purposes – from regulation of your body's temperature to shielding your internal organs. It consists of three layers: epidermis, dermis, and subcutaneous layer. However, trauma to the outermost skin layer can cause various injuries, including blisters. Blisters form to protect the deeper tissues from further damage by covering them with fluid which can either be clear (bodily serum), red (blood), or green (pus-filled infection ...