WASHINGTON -- The U.S. Food and Drug Administration warned consumers yesterday that it is investigating side-effects associated with a popular brand of ink used to perform tattooing of lips and eyes. The FDA said it has reports of more than 50 adverse reactions to certain shades of Premier Pigment brand ink. They include blistering, swelling, cracking and peeling skin around lips and eyes that, in some cases, caused serious disfigurement and difficulty in eating and talking, federal regulators said. The suspect inks are made by American Institute of Intradermal Cosmetics based in Arlington, Tex.