My Son Is 21 And Has Food Allergies And Environmental

My son is 21 and has food allergies and environmental allergies. He takes Zyrtec daily and uses Proventil inhaler as needed but not often. He has eczema on his arms but mostly has very flakey, itchy and red skin on his face and eye lids. Lately he wakes up with swollen eye lids. Could he be allergic to his laundry detergent? He already tested positive for the ingredients in his shampoo and shaving cream and is now using the Free and Clear products. This helped his skin some but now he is back to the same symptoms. What could this be?