Sun Tans should not be permanent and if you have a Sun Tan that seems permanent and won't go away then it's likely a sign that you're tanning too much and causing permanent damage to your skin.
Too much Sun Tanning can cause premature aging, wrinkles, saggy and leathery skin, ugly age spots and discoloration.
Regular sun tanning can also increase your risk of developing skin cancer, which can be fatal.
You can try to get rid of a Sun Tan by rubbing a sliced lemon on the Sun Tan and it should fade overtime.
Another way to get rid of a permanent Sun Tan is to use Cucumber Extract, Lemon Juice and Rose Water.
Mix one tablespoon of each of the 3 ingredients in a bowl and dab it generously on your tanned skin.