A sign inside a Queensland retailer's store has led to a flood of online complaints and calls to boycott the store.

Cold Steel Piercing in Cairns North is understood to have turned a customer away purely because they were Israeli.

Mohr Wenger alleges she was told by Cold Steel Piercing staff she would not be served because she was Israeli. Credit:Facebook

This allegation comes from comments posted by Mohr Wenger on her Facebook page, including an image of the alleged sign.

"The guy looked kind off (sic) confused and asked us where do we come from? Israel," Ms Wenger's post said.