Is cellulitas contagious? a friend of mine has it near her mouth

Yes. : Yes. The best way to prevent the spread of infection is to avoid kissing, sharing beverages, lip stick/chap stick, etc.. Also hand washing is key in preventing the spread of infection as well; this goes for the affected person as well as all others in close contact. Take care.

Yes: it takes several days of antibiotic therapy to make one non-contagious.