I Have always had small rashes when I use soaps with dyes and perfumes,but last week my wife bought a new detergent and I dont know if the red bumps are from that or from ????????? The bumps are only on the backs of my legs,hips and butt cheeks
It is quite possible that the detergent is giving you grief. Have your wife do two "final rinse" cycles to make sure all of the detergent is out of the clothes. good luck