55 yo male. 3 itchy bumps developed on upper right arm followed by same on middle two knuckles of left hand. rapidly developed into red, swelled bumps, With in 12 hours, three swollen knuckles with very defined red bumps on left hand. top of left hand has swelling and small bumps. itchy bumps on left forearm and elbow, right upper arm and elbow. no know allergies, not obvious insect bites.????