If you go to the west of Falador, you will see an icon on the World Map which shows Makeover Mage (alternativley, you could just search for the Makeover Mage on the world map and press enter). For a small fee of 3k, she allows you to change your skin color and/or change your gender.
You can change your minecraft clothes if you change your skin or download a mod.
what is a small bump on the skin
The real answer is wart
The small bump-like growths of skin that cover the turkey's neck are called caruncles. The wattle hangs from the front of the turkey's throat and the snood hangs from its forehead.
A bump is a lump like, for example, a bump on your skin or a bump in a road.