my fiancée had an upper GI done, they found dark spots inside his stomach, they did a normal biopsy and they said it was nothing. what causes the dark spots? and should we have another biopsy done further? since dark spots from what I hear a normal biopsy cant pick up cancer , u have to go futher deeper into the dark spots to get a reading? should we get a second opinion? hes having nausea , fullness in stomach, and gets sick when he eats. but no vomiting . should we get these spots retested?