Do you take a patch test every time you dye your hair? Nah, us neither.

But after seeing the completely crazy allergic reaction this woman had to a standard colour, we'll definitely be more careful next time.

One Imgur user posted these snaps (with permission) of her friend's "pretty ridiculous allergic reaction to hair dye." Behold:

And if you're thinking that this poor beauty victim must have grabbed the cheapest bottle of dye she could find in the Two Euro Store and rubbed it maniacally into her scalp, you'd be very mistaken.

In fact, her friend insists that she went to a professional stylist for the colour, and "they have used that dye on her in the past, so it wasn't expected."

After getting the colour applied, the woman experienced no pain for a full day, but within 24 hours her scalp had started to itch.

Within 48 hours her head and face began to swell, and she quickly headed to the ER. 

Luckily, the swelling began to drain and subside by Day 4 or 5, as you can see:

But – unsurprisingly – the woman says she's "never dyeing her hair again."

Shudder.