UN special rapporteur Yanghee Lee's 12-day trip, starting on Monday, will also take her to Kachin state, where thousands have been displaced by fighting between ethnic rebels and the army.
Intensifying clashes between Myanmar's military and ethnic minorities has undercut Aung San Suu Kyi's vow to bring peace to the country following her party's elevation to government last March.
The Nobel prize winner has also faced strong international criticism for failing to rein-in a months-long military crackdown on Rohingya villagers in northern Rakhine State.
Lee has slammed the lockdown as "unacceptable" and called for an investigation into claims troops have raped, murdered and tortured civilians from the Muslim minority.
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The army vehemently denies the allegations.
"The last few months have shown that the international community must remain vigilant in monitoring the human rights situation there," Lee said in a statement on Friday.
"Apart from what is happening in Rakhine, the escalation in fighting in Kachin and Shan (state)... Is causing some disquiet regarding the direction that the new government is taking in its first year."
Hardline Buddhist monk Wirathu caused outrage when he called her a "whore in our country" for criticising controversial legislation considered discriminatory to women and minorities.
Myanmar's government says its troops in Rakhine are carrying out legitimate clearance operations to hunt down "terrorists" who attacked police border posts in October.
On Wednesday an official commission probing the violence dismissed claims security forces are trying to force the Rohingya out of the country and said there was no evidence troops had carried out rape.
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