**Core Concept**
Kawasaki disease is an acute, febrile vasculitis of medium-sized arteries, primarily affecting children. The disease involves inflammation of the blood vessels, leading to various systemic manifestations.

**Why the Correct Answer is Right**
Desquamation and denudation of skin from fingers and toes occur due to the inflammatory process affecting the cutaneous blood vessels. This process is part of the subacute phase of Kawasaki disease, typically occurring 7-21 days after the onset of fever. The inflammatory response leads to the separation of the epidermis from the dermis, resulting in the characteristic peeling of the skin.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because desquamation and denudation are not typically associated with the initial phase of Kawasaki disease, which is characterized by fever, rash, and lymphadenopathy.

**Option B:** This option is incorrect because while the hands and feet are involved in Kawasaki disease, the specific manifestation of desquamation and denudation is not characteristic of these regions.

**Option C:** This option is incorrect because the peeling of skin is not a manifestation of the acute phase of Kawasaki disease, which involves more systemic symptoms.

**Clinical Pearl / High-Yield Fact**
Desquamation and denudation of skin are characteristic subacute phase manifestations of Kawasaki disease, occurring after the resolution of fever. These symptoms are crucial for diagnosing Kawasaki disease and distinguishing it from other febrile illnesses.

**Correct Answer: D. 21 days**