What is contained within the fluid raised area of a blister?

A blister is formed when there is friction or trauma to the skin, leading to the separation of the epidermis from the dermis. This separation creates a space that fills with fluid. The fluid typically found in the blister is serum, which is the clear, yellowish portion of the blood that remains after clotting. Serum contains various substances including electrolytes, enzymes, and antibodies, which can help protect the underlying tissue from infection and promote healing.

While pus may develop in some cases due to infection, it is not the typical content of a newly formed blister. Blood would indicate deeper tissue damage, and air is not a component of blister fluid. Therefore, the correct answer highlights the standard fluid composition found in blisters, emphasizing its role in the body's healing process.