"Ink Master" star Oliver Peck is learning the same lesson Justin Trudeau learned about blackface ... the pictures will emerge eventually, and it's never a good look.

Oliver apparently had the audacity to wear blackface on multiple occasions ... dressing up as black people over the years for different Halloween costumes. In a set of pics, you can see him applying the black makeup to his tattoo-covered body.

Peck's penchant for blackface was once proudly displayed on his MySpace account ... and now the images are circulating on social media once again -- and it's pissing off a lot of folks.

As you can see ... Oliver's wearing blackface and an afro for a superhero costume.

Yet another image shows Oliver in blackface, wearing a sports jersey, afro wig and headband while dribbling a basketball. He also wore blackface when he dressed up as a Playboy bunny.

It's unclear when the photos were taken.