Question:
What are yours?
Let me tell you, I've had a few in my time! I'm suffering the effects of one as we speak. (I won't tell you exactly which one though. )
Some of mine include:
- cutting all my eyelashes off... twice. I thought they'd grow back longer.
- using leg depilatory cream... on my face. (ouch!)
- reading that a heat pack would bring a blind pimple to a whitehead and burning my face.

Answer:
Waxing my own eyebrows with wax that was WAY too hot. It was burnt so badly, it even blistered! Not cool.

Answer:
Heres a makeup blunders thread
http://forums.vogue.com.au/showthread.php?t=235333
My contribution to that was putting a whole bottle of Sun-In in my hair thinking it washed out

Answer:
Don't feel bad. I am a Beauty Therapist and before I learned how to do things properly I did terrible things to myself.
I moved around too much after applying bikini wax and took too long to remove it. Then had great difficulty removing it
I silky-mitted my legs to within an inch of their lives and had red raw legs for weeks that were very painful to wash.
In the 80's I ran out of styling mousse and used shaving cream ( bad move as it contains ingredients to break hair down for shaving ) My permed/streaked hair started turning to chewing gum. Had to wash it out and was late for school.
Plucking my eyebrows too much in the early 90's. Only just started to thicken to normal.
xx

Answer:

i read in Dolly magazine that putting vegemite on your face was an excellent face mask. it drew all the ciruculation into my skin and my yukky zits became even more yukky, some of them even blood filled
another one was toothpaste - i had lots of zits in those days - put toothpaste on all of them and burnt my skin!

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Straight dettol on pimples burnt my face!

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I put normal household bleach through my hair once when i was a teenager

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I once silky mitted my legs red raw too! Never again!

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I guilty of applying too much blush. I cannot even look at old photos without cringing, it looked like this ->
Another thing I regret is not getting my eyebrows professionally pluck when I first started.... they used to look pretty bad.

Answer:
At school I had a very short bob, mid ear length. The shaved bit at the back got too long, so I cut it, by grabbing bits of hair and just cutting at it.
I ended up with heaps of bald patches - I covered these with a black permanent marker!