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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Tweet may have been deleted

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

Tweet may have been deleted

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

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