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Red itchy raised lesions over exposed areas which appeared over night most probably is an insect bite allergy
. You will get relief with anti histamine
tablets like Cetrizine
10 mg once a day and steroid ointment for application twice a day. A dermatologist
will be able to help you to identify the insect as we get some clues from the morphology and distribution of lesions. The importance of identifying the insect is for preventing further bites by adequate measures.
Hope this helped