I have a progressive darkening of the testicular sack, with a bright redness and increased irritation when hot. I also work in a prison and fear I may have ingested fecal and seaman matter which was laced in food prepared by an inmate. I have been to my doctor several times and have been tested for fungus, etc., and have used many creams, which initially lightens the discoloration, but soon returns. My question is there a diagnosis my family practice doctor may be missing and would it be related to the material ingesting, as the discoloration began shortly afterwards?