My 3 yr old son got these all over his body, legs and hands from our trip to the park today. It was around 12:30 pm when we were in the park and he ran to a different slide which was a little hot in the sun and he came crying when he got a "chatka" cos of the hot slide. Our regular Paediatrician recommended syp Atarax. will this allergy go away without taking the syrup? Will applying calasoft help?