The Irish singer-activist said he was "sick of what has happened in the last 12 months."
Nearly 90,000 Rohingya have sought refuge in Bangladesh in the past 10 days, fleeing the violence.
The U.N. is pushing for an enquiry into abuses against the Rohingya by the country's army.
The Myanmar army initiated a crackdown on purported Rohingya militants in October.
After winning a historic election, the Nobel winner needs to bring peace to all of Myanmar.
The opposition appears on course for a landslide in the first free elections in 25 years.
Activist's National League for Democracy party is expected to win largest share of votes.
Military uses veto to prevent changes to constitution allowing opposition leader to run.