Hand, Foot and Mouth or reaction to detergent?

2 year old had a fever yesterday all day and no other symptoms. He has no blisters in or around his mouth or on the sole/palms of feet/hands. The rashes are spread out. He has one spot under his ear, a few on his bottom, back and chest other than on his one hand and one foot. I also recently switched detergents so now I'm confused at the cause. What do you all think?

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