Things like wearing contacts and dying the hair are an attempt to conceal genetics

[Mister Obvious]

Then you have warped people who go around altering their appearances unnaturally...

Dying their hair unnatural shades, covering their bodies in tattoos, etc. these people are likely victims of abuse (or otherwise traumatized, specific types of trauma can cause this) and are trying to scare away any potential suitors in order to protect themselves.