black
if you mean like how to make your skin colour more fair then i suggest some skin cream
apply vitamin e cream/oil, scarfade cream or mederma for several weeks
To camoflauge. To protect themselves from possible predators. When they molt they gain oils that protect their sensitive skin.
clear
Cream and light brown
Rabbits are mammals. Mammals have a covering of skin and hair. In the case of rabbits we would call this covering skin and soft fur.
Purple.
red
Yes it is very good for your skin. It acts as a moisturizer and most act as a replacement for foundation. Some people use certain BB creams as a base then adds foundation but you don't have too. Lots of people say that BB cream helps to also brighten the skin. Unlike foundation that does nothing for you skin, BB cream is actually very healthy for you! I hope this helps!
Rabbits have fur over their skin.
The only reason the inside of the ears are pink is because the is no hair on them so you are seeing the bunnies normal skin colour underneath all of that hair.