Welcome to healthcare magic,
From your description and past history it could be hives
( Acute urticaria
) and need not be any viral inection. It is characterized by itchy red or skin colored raised wheals which is transient, that means appears in one place and soon disappears from there to appear somewhere else. The most common cause of acute urticaria is food. Seafood, meat, poultry, egg, milk, peanuts, apples, brinjal, strawberry, coloring agents etc are commonly implicated. It is subjective and any food can cause it. Other common causes are medicines, infections, insect bites
etc. Antihistamines like benadryl
is the medical treatment. Identifying the trigger and avoiding it is the best treatment.
Hope this helped