First of all, let’s get the alternate spelling out of the way. You may see it as aesthetician (as in aesthetics: how something looks overall, even the way people perceive beauty or art). We use the more scientific spelling: esthetician.
As an esthetician, you’ll specialize in skin, and focus on ways to make it more beautiful. Sounds like fun, but takes some skill. You’ll basically be a therapist — for skin.