Tea Tree oil is very good - a fantastic antiseptic, anti bacterial, anti viral, anti fungal oil (to name but a few of its properites) it also has slight analgesic properties, which is why it helps stop the itching. Lavender is more effective for p as it is also a better anti inflammatory (takes down the reddness) is more soothing and less harsh than tea tree.
Only use essential oils in small amounts - 6 - 8 drops in total in any one treatment.
Su