To add what I've already tried: Aveno body wash. Tea tree and mint body soak. Yardley's Lavender bath soap, waterless skin cleanser. Short of bleach or dawn dish detergent, I don't know where to go from here.
The shirt was washed with other darkish colors and did bleed enough to discolour the pocket linings on a couple of pairs of new jeans.
I therefore washed the shirt a second time in hot water to "set" the dye. I really like the shirt, but if I can't get my skin back to the right color, it's going back to Kohl's and I might get myself arrested ifI have to show what the problem is.