I love Tea Tree oil! I use it to cleanse my skin and open my pores before applying Henna.It works GREAT! I bought mine at Trader Joe's, it's 100% pure and in a small bottle. I also have Melalueca oil but I have not yet tried it.
And I guess I'm weird.....I think Tea Tree oil smells good, not something I'd want to wear in public but I think it has a very clean smell.Strong yes, but clean.
Tea Tree Oil and Melalueca Oil are the same thing. The Tea Tree plant is Melaleuca alternifolia.
I tried Tea Tree for DS' acne, but he hated it so much that it just wasn't worth it -- some people just gag on the smell.
I just got it yesterday and since I use it for a specific task I haven't had the chance to try it out. But yes, it's the same thing. 
To Update:
I have used the OCM on my daughter twice now, on her face and back. I've used a mixture of Extra Virgin Olive Oil mostly, Castor Oil amounting to about a quarter of the total amount of EVOO, and just a teeny bit of tea tree oil. At first my daughter squinched up her face at the scent of the tea tree, but then after a while she said it made it seem like a real spa!![]()
This morning when she got up and went towards the bathroom I had to stop her and STARE... I could NOT believe how much better her back looked!! She craned herself around to see it as well and was SO excited! We're going to keep this up each evening, with her regular cleansing in the mornings (since she usually doesn't have time for the whole ritual in the morning).
OH!! And if anyone's looking for it, Rite Aid is currently having a sale with Tea Tree Oil buy one get one free. Since the teeny little bottle cost $10, that was a REALLY nice find!
So do you use it 2x a day on the back? Or is it ok to just use at night? I am going to try this. Proactiv did absolutely nothing except stain her clothes and sheets. Using Murad now. Stuff from the Dermatlogist didn't even help. Also, do you steam the back, too?
but once they settled, this morning, the difference was amazing! I hope it continues to work as well.

It has done an amazing job, and we'll be continuing with it for, like, ever
This weekend my niece came over and we started her on it too, heh. Sent her home with a bottle of the concoction and instructions. It's also working well on her face, but her back was her biggest concern, heh.And I guess I'm weird.....I think Tea Tree oil smells good, not something I'd want to wear in public but I think it has a very clean smell.Strong yes, but clean.
We use TTO as an antiseptic. We also put a drop in the bottom of our trash cans.
. As someone else explained, Melaleuca oil, is the real name for Tea Tree Oil. It works amazing on acne. My 15 year old son and 17 year old god daughter both us an acne system based on Mela. oil which runs $14.95 a month. And our goddaughter had tried it all, from doctor prescribed treatments to pro-active, with minimal success. It does also work great on dandruff, but you do not apply it directly to the scalp. I personally also like the smell of it, and have a cleaner made up of primarily mela. oil that I use to sanitize my counters, toilets, and everything in between. Best of all, it is natural and not caustic like all other cleaners you can buy. 
I was surprised to find that I didn't mind the smell at all and isn't as bad as I have read(at least to me anyway). They were selling it as a hair/scalp treatment.