Hi. Welcome to HCM from what you described you seem to be having allergic reactions causing wheals or hives. Is this the first episode or do you have a previous history of allergies in the past. Try and recall any possible cause of the rash. Any history of outdoor activity, exposure to plants, dust, animals, chemicals, any medication , any particular food. Anything you have been allergic to in the past? Once you can narrow down the possible factor, you will have to avoid it or you will keep having similar reactions. Seeing circles and lines, either white or reddish wherever you apply pressure, or scratch, is called dermographism and is a sign of sensitivity and high allergy levels in blood. So do consult a doctor regarding tests for the blood levels of eosinophils, serum IgE etc, which can show allergy. Skin tests can also be done to check specific reactions. Very rarely this reaction can happen even in normal skin. Apply a menthol/calamine lotion for the itching, 2-3 times a day. Start an antihistamine daily for 5-7 days after consulting the dermatologist. They may advise a longer course after seeing your blood work. This can help bring the allergy levels in control. If it is severe or persistent, you may be advised a cortisone shot in the ER. Use a mild soap for washing, avoid harsh chemicals. In case you have severe swelling, puffiness of face, lips, difficulty breathing, etc go to the ER immediately. Hope this helps guide you. Try to see the doctor as soon as the rashes appear.