Which is a sign of allergic effects from pesticide exposure?

Hives and blisters are notable signs of allergic reactions to pesticide exposure. Allergies can manifest in various ways, and the presence of hives—raised, red, itchy welts on the skin—indicates a histamine response, which is characteristic of allergic reactions. Blisters may also develop as a result of this immune response, particularly in individuals who have a heightened sensitivity to allergens found in pesticides.

While skin discoloration, eye irritation, and throat irritation can occur due to pesticide exposure, they may not specifically indicate an allergic reaction. Skin discoloration often relates to chemical irritation or burns rather than an allergy. Eye irritation could signify chemical irritation or toxicity, and throat irritation is commonly associated with inhalation of the chemical rather than an allergic response. In contrast, the presence of hives and blisters specifically reflects the body's immune system reacting defensively to a perceived threat, distinguishing it as a clearer indicator of an allergic effect.