A pair of Manhattan doctors removed a lethal tumor the size of a cantaloupe from a 5-year-old Ethiopian girl’s face in an intense, hours-long surgery — and she proudly showed off her new mug on Tuesday. Little Nagalem Alafa, who lives in a rural village in the African country, has never had access to specialized healthcare and since birth, has suffered from a “vascular malformation” on her face that’s kept her out of school and prevented her from socializing with kids her own age.