Layers of the dermis

What layer is found only in thick skin? Where is thick skin found?
What are the 2 layers of the dermis? What is the principle tissue type in each layer?
What are dermal papilla? What structures are found in the dermal papilla?
What are the 3 pigments that combine to determine the skin’s color? What is the origin of each pigment?
What are the 4 sweat glands (or modified sweat gland)? Describe the product of each gland.