PEBBLE BEACH, Calif. — Tiger Woods pulled out of his next two tournaments because of ongoing back problems, a somber outlook for a 14-time major champion whose comeback barely lasted three tournaments before another setback.

Woods said Friday on his website that he was still coping with back spasms that he attributed to his withdrawal from the Dubai Desert Classic last week.

“My doctors have advised me not to play the next two weeks to continue my treatment and to let my back calm down,” Woods said. “This is not what I was hoping for or expecting.”

The Tiger Woods Foundation now runs the Genesis Open in Los Angeles, and Woods was expected to play Riviera next week for the first time since 2006. He also withdrew from the Honda Classic near his home in Florida.

Woods said he would still go to Riviera to support the tournament.

Woods was out of golf for 15 months while recovering from three back surgeries and returned with high hopes at an unofficial event in the Bahamas the first week in December. Woods made 24 birdies to offset a litany of mistakes and finished 15th in an 18-man field.

His return to a full field didn’t last long. Woods didn’t make the cut at Torrey Pines, and lasted only one round at Dubai.