You may develop a red, itchy, and swollen rash and blisters that ooze and crust in response to an allergy. An underlying condition, such as lupus, psoriasis, or shingles, may be the culprit in ...

If you have a red rash on your hands, arms, or legs that's accompanied by intense itching, you may have had a brush with poison ivy. Here’s what to do if you think you’ve been exposed to the ...