Mrs. anderson presents with an itchy raised rash that appears and disappears in various locations. each lesion lasts for many minutes. which most likely accounts for this rash?

The rash was most likely caused by hives. Hives disappear and reappear on different parts of the body and are known for changing their form when they reappear. The itchy rash quickly turns into welts that irritate the skin. Mrs. Anderson's itchy rash lasts for a few minutes and disappears, which sounds like hives, since they can disappear just as fast as they appear.