Do a search for 'urticaria images'. This would be an allergic reaction and not uncommon. Instead of using detergents or soaps use only a saturated borax solution on your body and in your laundry.
People with gluten sensitivity develop various kinds of skin rashes, the most troublesome is Dermatitis herpetaformis.
Doing parasite and other cleanses may help if this is not urticaria.