I'm late to this thread but did want to mention being tested for copper toxicity. Zinc is a crucial mineral that we need in abundance. However, many people have too much copper these days, and that pushes zinc way down. Zinc is crucial for skin health. Check out http://www.drlwilson.com regarding copper and zinc. Hair analysis is an excellent way to see what's going on with all your minerals. You mentioned having asthma...your liver is likely compromised. Copper is stored in the liver and reduces its ability to function.
My high copper never caused skin problems, but it did cause fatigue, migraines, mood swings, etc. I'm see very good progress in getting rid of all those. Taking the right supplements based on my most recent hair analysis along with some important detox procedures, including coffee enemas, eating the right diet for my oxidation type, etc., are all moving me in the right direction. I highly recommend hair analysis and working with a Dr. Wilson-trained practitioner.