Dude realizes he's allergic to hair dye just a little too late

Here's a wild story for anyone who regularly dyes their hair.

Per an enormously popular tweet posted Thursday, a student suffered an unexpected allergic reaction to hair dye. In the photos -- shared by a classmate who goes by Stina Jörnvik on Twitter -- the student's forehead and hairline are completely swollen.

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Jörnvik's photos quickly found their way to Reddit, where people marveled at the allergic reaction, and swapped similar stories.

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We're guessing this is one of the reasons why hair dye instructions encourage users to do a swatch test first.