Hi I would cough up black specks about once a week it's usually thick and gooey with black dots. I been to multiple hospitals I had multiple test done the doctors keep telling me I'm fine but I don't believe it I had a x-ray a CT scan a sputum test and they keep telling me it's allergies. Im worried it could be melanoma in the esophagus, Lungs or mucas membranes the doctors isn't taking me seriously saying I'm over reacting I used to smoke weed a cigarettes I hope it's just tar but I don't know I lost hope I'm terrified actually planning my funeral please help I'm so lost and scared..