My father is 72 yes old. Is in e,cellent health, and takes a low dose medication for high blood pressure. He lives just north of Houston, Texas, is married for 26 years, and works full time for a construction company driving a pickup truck that is used to drive full dumpster from job sites to the city waste facility. He started theis job about a year ago. About the same time, he has developed a rash that looks somewhat like mosquito bites, and itches incessantly. He has seen doctors tnat have treated with allergy shots, some kind of light treatment, also changed detergents, body soaps, etc to low reactive versions. Nothing has helped. Heat may or may not worsen the problem. He was recently off work for five days and the symptoms did not go away. Any thoughts?