Meh....a quirk of mixed racial genes. My own lips are just about the same color as Obie's. My ancestry is about equal parts European, African, and Native American. If my family posed in a photo with Obama, he'd fit right in.
Who knows what his actual genetic lineage is? It's a secret he refuses to share. Now, here's one possible explanation for his purple lips:
The currently known numbers (assuming they are correct) pretty much establishes Stanley Ann as having become Pregnant in November-December of 1960, when she was known to be living in Hawaii. Realistically, MalcolmX was in no position to accommodate her, and if my understanding of his attitudes about his faith are correct, he was not likely to be willing to do so even if an opportunity had presented itself.