What is the primary clinical feature associated with exposure to a vesicant agent?

The primary clinical feature associated with exposure to a vesicant agent is skin blistering. Vesicants are chemical agents that cause severe skin, eye, and respiratory tract irritation. When the skin comes into contact with a vesicant, it can lead to the formation of painful blisters and ulcers due to the destruction of tissue. This blistering is a key identifying characteristic of exposure to these agents.

Other symptoms may accompany exposure, such as respiratory issues or systemic effects, but skin blistering is the hallmark that specifically indicates the presence of a vesicant agent. Understanding this symptom is crucial for EMTs as it helps in recognizing and responding to chemical exposure incidents effectively.