McDonald's has recalled its Step-It activity wristbands found in Happy Meals due to recent complaints of skin irritation and burns.

According to the U.S. Consumer Product Safety Commission, the recall came after McDonald's received more than 70 reports of incidents, including seven reports of blisters, after wearing the activity trackers.

29 million units in the United States and 3.6 million in Canada are being recalled. One woman wrote on Facebook that her child was burned by the toy after playing with it for only eight minutes. Her post has been shared more that 130,000 times.

The recalled activity wristband trackers found in Happy Meals and Mighty Kids Meals come in two different styles: Activity Counter and Light-up Band. The plastic pedometers come in six colors and blink quickly or slowly depending on the pace of the person wearing it.

Before the recall, the company voluntarily removed the product, citing similar concerns.

"We have taken this swift and voluntary step after receiving limited reports of potential skin irritations that may be associated from wearing the band," McDonald's spokeswoman Terri Hickey said in a statement. "Nothing is more important to us than the safety of our customers and we are fully investigating this issue," Hickey said.

Consumers are advised to immediately return the activity trackers to any McDonald's for a free replacement toy and either a yogurt tube or bag of apple slices.