It was "heartbreaking," he said after meeting a young man with a raw, open leg wound from a road accident and no means to treat it.
Mothers carrying babies with clear signs of malnutrition stood listlessly outside row after row of identical bamboo huts, toddlers playing nearby in the chalky white dust.
"No one should have to live like this, people are really suffering," said Dillon, one of the first celebrities to get a look at what life is like for Rohingya in the western state of Rakhine. "They are being strangled slowly, they have no hope for the future and nowhere to go."
Taking advantage of newfound freedoms of expression, radical monks started fanning deep-seated societal hatred for the religious minority. Hundreds have been killed by machete-wielding mobs and a quarter million others now live under apartheid-like conditions in camps or have fled by boat hundreds of dehydrated, hungry Rohingya washing onto Southeast Asian shores in recent weeks.
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Denied citizenship, they are effectively stateless with almost no basic rights. As they become increasingly marginalised, several groups are warning that the building blocks of genocide are in place.
"I've been to some places where the threats of violence seemed more imminent," said Dillon, who has also visited refugee camps in Sudan, the Congo and elsewhere. "Here it's something else. It feels more like people are going to be left to wither away and die."
Dillon said he decided to come to Myanmar following a desperate, urgent appeal by Rohingya activist Thun Khin at a Refugees International fundraiser in Washington, just over a month ago. In Japan to promote his new television series, "Wayward Pines," he decided it was a good time to make the trip.