My doctor had told me I had an allergy to dust mites, so this prompted me to go through the whole house and wash everything with a few drops of water solubile tee tree oil in my regular wash. Within afew days my arms and legs had broken out in nasty and severe itchy welts. I'ts now been a week and I've had to get a steroid to settle my skin as I'm at witts end with the itchiness and not getting sleep at night because of it. I've re-washed everything again, but there is obviously residue becuase as soon as I use the sheets or towels that was washed with tee tree oil I break out again.