Dyskeratosis congenita (DKC) is a rare inherited disease characterized by the triad of abnormal skin pigmentation, nail dystrophy, and mucosal leukoplakia.
Methylmalonic acidemia is an inherited metabolic disorder,which is caused by deficiency of methylmalonyl-coenzyme A mutase or its cofactor adenosylcobalamin.
If that mutation were inherited from your parents or occurred early enough in your development, then the result would be that many or all of your cells contain this harmful mutation.