Re: itch acne with pus = healing?
Well, my Mom always told me that when a cut starts to itch that this means it is healing. I guess that this also applies to acne, but I'm not sure. As far as putting sunscreen on you face when you have acne, definately yes. The acne will be less likely to scar if you protect it from the sun. Use a sunscreen that is made for the face and won't break you out more. They will usually say when it is made for the face.
I can't comment on the tea tree oil. I have never used it.