Started using new fabric softener a few days ago and this morning found this rash on 2yo DS. It went after about 30mins but throughout the day he has been having patches come and go - mainly on arms and legs, a few on his face and one patch on chest. He doesn't seem to find them itchy, they just feel very hot. They come up quickly then go within 30 minutes. Could it be a reaction to the softener? I've washed his bedding and clothes in the old stuff now, just in case.