The toddler was playing on the monkey bars in Millennium Park when the incident occurred.
The boy's father was on hand to treat the wound and contacted the East Moline police force.
Upon further inspection, more razor blades were found glued to equipment throughout the playground.
Speaking to local news station WQAD8, the outraged father condemned the act and the vandals who committed it.
"It’s pretty sick. Psychotic. Luckily, it wasn’t deeper. He wasn’t old enough to put his weight on the monkey bars," he said.
Police scoured the scene at Millennium Park, recording and removing all the blades.
A dozen were found in the area, attached to the equipment with a white putty-like adhesive.
Lieutenant Brian Foltz with East Moline police said: "I've seen a lot of things, but not razor blades glued to equipment at a park".
Once police had ensured the safety of the playground, they proceeded to check other parks in the area.
"We wanted to check out, just to make sure, and so far, we have not found anything else in any of the parks," said Foltz.