Camp Lakebottom

'Camp Lakebottom' is a Canadian animated series that premiered in 2013 on Teletoon in Canada and Disney XD in America, and ended in 2017. The cartoon is about three twelve-year-olds, McGee, Gretchen and Squirt, who wind up in Camp Lakebottom after taking the wrong bus for summer camp.

S1E7A: Marshmallow Madness
When the kids eat a batch of wild marshmallows and gain itchy marshmallow lumps on their bodies, they find that scratching them only creates more marshmallows. One of the methods used to combat this has them wearing inflatable suits, only for a rake to puncture them thanks to Squirt using it to scratch himself.