His first major successes came at the World Cross Country Championships, where he won in 1990 and 1991. Over the next four years, he always ended up at the World Cross Country Championships between number four and seven. His first major championships on the track were the World Athletics Championships in 1991., Where he won the 10,000 -meter run the bronze medal and finished sixth in the 5000m.
At the 1992 Olympics in Barcelona, Skah delivered in the 10,000 - meter race in a duel with the Kenyans Richard Chelimo. As both the Moroccans Hammou Boutayeb lapped, this disabled the Kenyans and Skah was the race to decide for themselves. After the race Skah was alleged to have illegally benefited from this disability and was disqualified. Later, however, this decision was revoked following a protest by the Moroccan Association. The Spanish audience acknowledged this supposedly intentional obstruction in which it at the awards ceremony produced a shrill whistling while the Moroccan anthem.
At the World Championships in Stuttgart in 1993 was Skah fifth over 5000 meters. In the same season he set up his one world record and ran on July 31 in Hechtel two miles in 8:12,17 min; in the fall he won then the Zevenheuvelenloop about 15 km in 43:35 min. In 1994 he won at the World Half Marathon Championships, and in 1995 he became vice - world champion in the 10,000 meters.
Shortly thereafter, on September 18, 1995 Skah received the citizenship of Norway, the land of his wife, where he had lived for years and trained, but still started for Morocco. Other great performances on the track had Skah at the 1996 Olympics in Atlanta, where he finished seventh in the 10,000 m, and at the 1999 World Championships in Seville, where he finished tenth over the same distance.
For career end he turned to the road race. In 1998 he was third in the World Half Marathon Championships in his personal best time of 1:00:24 h, 2001, he won the Great South Run over 10 miles in 46:17 minutes, and in 2003 he participated in the marathon at the World Championships in Paris/Saint- Denis in part, in which he finished in 38th place.
At a size of 1.70 m, it had a competition weight of 58 kg.