my brother took a saliva dna test yesterday. Saliva collection. His saliva looked brown, as though he had drank coffee before spitting. He is morbidly obese. Severe incontinence. Believes a spider bit him in the throat months ago, as he has the feeling of something in his throat when he swallows. I don't know about the spider theory, but I am worried about his feeling something in his throat when he swallows and then there is the alarming color of his saliva.