Which lesion is a dried mass that remains after an oozing sore?

Which lesion is a dried mass that remains after an oozing sore?

• A. Ulcer
• B. Pustule
• C. Vesicle
• D. Crust

Answer: (D)

A crust is the dried mass that forms on a healing sore when the oozing fluid dries on the surface. It comes from dried serum, blood, or pus and acts as a protective covering while new skin forms underneath. This is different from an ulcer, which is an open sore where tissue has been lost; a vesicle, which is a small blister filled with fluid; and a pustule, which is a small bump filled with pus. The crust is essentially the dried exudate remaining after the sore oozes.

A crust is the dried mass that forms on a healing sore when the oozing fluid dries on the surface. It comes from dried serum, blood, or pus and acts as a protective covering while new skin forms underneath. This is different from an ulcer, which is an open sore where tissue has been lost; a vesicle, which is a small blister filled with fluid; and a pustule, which is a small bump filled with pus. The crust is essentially the dried exudate remaining after the sore oozes.