I have been getting this swelling itchy redness on different parts of my body, it will last for 12 to 36 hours then go away and return days or weeks later on a different part of my body, right foot, groin, left foot, lips, waist, left hand. Usually it starts by being itchy, then within an hour starts to turn red, then swelling will spread or just move and skin gets real tight, then eventually goes away...I take Benadryl to calm the itch