never incorporated pure essential oil into my routine, but I found some of the opened skincare products of mine contain eo. I think it's still fine to my acneic skin.
essential oil (EO) comes from natural ingredients, even they're naturally derived from plants, doesn't mean they're risk-free, since it's highly concentrated.
ex: tamanu is claimed to have anti-inflammatory benefits, but for some people that allergic to nuts, it'll irritate their skin. lemon & citrus fruit can cause sunburns when it exposures to sunlight.
so remember to conduct a patch test before using it to reduce the risk of allergic reaction.
some people might be able to use it, while others might not. the only way to find it out is to try it by ourselves. or maybe we can discuss any potential negative reactions to a dermatologist before adding it to our routine.