Blisters on the skin may come from a variety of sources but the most common are from repeated rubbing on the skin and 2nd or 3rd degree burns. Badly fitted shoes or boots can cause blisters on heels, toes, or balls of the feet. Using yard tools with repeated motions without wearing gloves is another common source. The best cure for these types of blisters is prevention. Test new shoes and boots before going on extended activities. Wear gloves if your hands are not calloused when doing repeated motions with tools.
All this being said, blisters happen. The greatest problem with blisters is the potential for infection as the blistered skin peels away revealing the dermal layer, which is more prone to infection without the protective epidermal layer of skin not to mention the painful discomfort. Essential oils are ideal for this situation since many oils are both analgesic as well as antibacterial.