Hello, first time poster here. So, I woke up this morning after sleeping on the floor (family over), and I was sweating. To think of it, I was sweating all night. I began to itch once I was awake and noticed a large hive/rash on both my inner thighs, inner arms, outer chest(near nipples), and on the inner elbow of one arm.I slept on my right side and on that side(chest/arm wise) the rash seems to be larger. Is this a heat rash? or some kind of allergic reaction?