Scilligo was born in the Val Formazza. In 1931 he placed second in the 18 km cross-country ski event of the Italian mastership. Two years afterwards he finished fifth together with his team colleges Frederico De Zulian, Andrea Veurich and Severino Menardi at the 4x10 km relay event of the FIS Nordic World Ski Championships 1933, and was a member of the national Olympic military patrol team, which placed first at the 1936 Winter Olympics.