basil
bergamot
clary sage
clove
eucalyptus
fennel
lavender
lemon
pine needle
rosemary
Spanish sage
tea tree
thyme
All of these are good for any kind of virus or infection. Tea tree is the best antiseptic oil.
Lavender is a good all-purpose oil and can be put directly on the skin without diluting it (tea tree is the only other oil on this list it's safe to do that with). A dozen drops of lavender oil in a good, emmolient carrier oil, like sweet almond, also works wonders on sunburn; it reduces pain and itching, speeds healing and reduces flaking.
If you need something with stronger antiseptic properties (lavender works well on scrapes and small cuts), infuse clean marigold petals in hot water, let cool, and then apply to the injured area as a moist compress.
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There are many, however the two that come to mind first are Lavender & Tea Tree.