question: Hello... for 6 months my hair has been falling out....I am 75 yrs. of age..and the back of my head is getting really thin....Went to family doctor and he prescribed called Selenium Sulfide Topical Suspension USP.  2.5% but have not used it yet....some Medical student told him I had a little fungus on scalp...I think he saw a birthmark.. have no problelms with scalp....so what do I do....Shampoo are not.....