S.C.
My 17mth old got exactly the same rash you described the other day and I googled it and saw this feed. She also had eczema as an infant. The 1st time I saw it I went straight home (after a painful 30minute drive) and bathed her and within minutes the rash started to die down and she seemed less itchy. Today it started to welt up again so after we finished playing I gave her a wet towel wipe on uncovered areas before getting in the car to go hm.... Didn't get half as bad...... Bit of extra effort but beats her being uncomfortable. Just recently her eczema (dry red patches) has come back a little on her legs and usually after a couple of days at daycare.... No bark chip there, but sandpit.... Both dusty.... but different reactions...?