Hi, welcome to our site. I am Dr Saumya Mittal, MD. Read your query. That is a very significant question and i appreciate your problem. I will try my best to answer your query I feel that his problems is the fumes that they worked with. It is possible that the respirators they were using were not so tightly applied. In this case, the fumes may have entered his lungs. Some of it is easily absorbed via the skin as well. Once they are in the circulation, it takes time for the body to clear them as some of them really attach to the blood components and do not budge until the blood is gradually replaced by the body. I would agree with the doctors because the examination would be normal. However, a blood electrophoresis test may help them find the defects. I suggest some fresh air and high concentration oxygen breathing. I hope this helps you. Inform the reports mentioned above/if any other so I can be of help further. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. You can upload them on the site. You can upload them with the query, or if you have a problem, send them to attachments@healthcaremagic.com with Sub: ATTN Your Name . Once we receive the photos or diagnostic reports, my team will send reports / pictures to me. Please do understand that some details could be extracted from a detailed history and examination. Please click on Thanks/Helpful if found useful. Please feel free to ask another query. I would be glad to help you. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this) Best of luck. Dr Mittal. MBBS, MD (Internal Medicine), CC (Diabetes Mellitus), DNB (Neurology)