Eyebrows are the same as all other hairs; they have a terminal length and a growth and shed cycle. Some people use castor oil to help regrow their eyebrows.
Mine are dark and fairly long (not many people have to trim theirs!) so I don't have to do anything to help them. I don't have dry skin there but I cleanse tone and moisturise them too because I often use an eyebrow gel to keep them in place. That's enough to keep my skin there happy.
I don't think I know what you mean about "if you left your eyebrows what would happen?", but someone is bound to!
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