The whole movie is black and white, mostly likely in the style of redbull comercials mostly white only the linearts and cheeks colors are colored. Our protag is a little boy, end of middle school or first year in high school and he had a cronic case of blushing. He blushes in the most inappropriate time no matter what.
He narrates the whole movie, how difficult his life with such a weird medical condition.
There is a scene where the teacher suspects multiped students are cheated on the test and everyone in the whole class blushes excepts our protag.
At the mid-point he a new kid turns out at the boy's aparment compex who has a cronic case of sneezing.
They grew up together, to the point that thet both of them got wivies and children. The blushing one's kid is a cronic sneezer, while the cronis sneezer's one is a cronic blusher.
I sew it ones between 2007 and 2010 at the hungarian comercial tv channel, TV2 either around xmas or easter, but surely it was some holiday.
I higly suspect it to be a french production, 1hour or so, fully animated, lacking colour, mostly narated by the blushing kid.