Red Bumps After Using Soap. Is It Allergy ?

Hi, my fiance has a problem with his feet for about two years now. It started after his feet got burned with acid at work. They itch and burn. Sometimes there are blisters, sometimes a clear liquid comes out of them, then they will dry up and peel skin off, and turn red. They are a lot better then they used to be but it seems eveytime it clears up it comes back. He went to a doctor when it first started and he took a sample of the liquid coming out and said he saw nothing. He got a shot of pennacilin and they cleared up good but came back. Now he also has similar marks on his head from wearing a hat backwords while having a welding helmet on. They look similar to his feet. He has stopped wearing a hat for about two months now and they look a lot better and are dried up but still wont go away. Then last week he did some welding for many hours and burned his forearms. They have started peeling but now on his arms and shoulders are red bumps everywhere. Even in some places starting to look similiar to his feet and forehead. He has gotten the red bumps before but only on his sides after using a certain soap and we believe a fabric softner. Since then we have stopped using these things. Any ideas on what this could be? Please help! Going to the doctor this week but really wanting multiple opinions!