Blister agents are a type of chemical warfare agent that cause painful blisters on the skin and damage to the respiratory system. They are typically classified as a subset of chemical agents known as vesicants. Common examples include sulfur mustard and lewisite, which can be dispersed as gases or liquids. When exposed to blister agents, individuals may experience symptoms such as skin irritation, severe burns, and respiratory distress. These agents can have long-lasting effects, as they may remain in the environment and continue to pose a risk long after their initial use. Proper protective measures are essential to mitigate their harmful effects.