A rare skin infection contracted through touching contaminated seafood has afflicted at least 30 people in the New York City area. Health officials are warning New Yorkers to avoid touching raw fish and seafood at Asian markets in Flushing, Queens; Sunset Park, Brooklyn; and Chinatown in Manhattan with bare hands. The infection presents itself as swollen red bumps on the skin and occurs when Mycobacterium marinum bacteria enters the body through cuts in the skin.