Found this mark on my son neck today morning, he was sleeping in mosquito net... please let me what is it . what kind of mark it is.

A. Summer season is there so special protection is required for the child you should maintain proper hygiene and temperature specially of the room use cotton clothes which are loose fitted and also give plenty of liquids and jg fruit juices frequently to maintain proper hydration also you can use zocon dusting powder to avoid heat rashes and give daily bathing .