Oregon Written Tattoo Practice Test

The type of lesion characterized by irregular borders and sharply defined edges is typically associated with urticaria, commonly known as hives. These lesions often present as raised, itchy welts on the skin that can vary in size and shape. The sharply demarcated appearance is due to localized swelling in the skin, which causes the lesions to stand out against the surrounding unaffected areas. This distinct sharpness helps differentiate urticaria from other types of lesions, which may not have such well-defined edges or patterns. In contrast, pustules are small, inflamed lesions that contain pus and may not necessarily have irregular borders. Bullae are fluid-filled blisters that can also have rounded and smooth edges rather than irregular. Erosions refer to areas where the surface of the skin has been removed but do not typically exhibit irregular borders. Thus, the sharp demarcation and irregularity in the context of urticaria make it the correct answer.