No, Bio Sculpture Gel does not cause any fungus or nail mold. Bio Sculpture Gel has undergone a stringent “Clinical Test” to assess the tolerability and efficiency of Bio Sculpture UV light-cured nail gel in first-time and long-term users – (Aug 2004). The research result showed that one hundred percent (100%) of first-time users, and ninety nine percent (99%) of long-term users, reported no paronychia or contact dermatitis. Consequently, the conclusion was drawn that Bio Sculpture UV light- cured nail gel is both highly effective and tolerable for use as cosmetic nail gel. It received a 5-Star Safety Rating.