## Core Concept
Kawasaki's disease is an acute, systemic vasculitis that primarily affects medium-sized arteries, particularly the coronary arteries, in children. It is characterized by inflammation of the blood vessel walls, which can lead to complications such as coronary artery aneurysms. The disease presents with a classic set of clinical criteria.

## Why the Correct Answer is Right
The classic criteria for Kawasaki's disease include fever for more than five days, bilateral nonexudative conjunctivitis, changes in the extremities (such as erythema of palms and soles, and desquamation), a polymorphous exanthem, and cervical lymphadenopathy. Among the provided options, without specific details on A, B, C, and D, we can infer based on common knowledge of Kawasaki's disease that features such as coronary artery involvement, desquamation of hands and feet, and specific types of rashes are characteristic.

## Why Each Wrong Option is Incorrect
- **Option A:** Without specifics, we can't directly address why A is incorrect, but if A describes a known criterion for Kawasaki's disease, then it would not be the correct answer to the question about which is not seen.
- **Option B:** Similarly, if B aligns with Kawasaki's criteria, it wouldn't be the correct choice for an exception.
- **Option C:** If C is a feature commonly associated with Kawasaki's, then it's not the exception.
- **Option D:** If D mentions a feature not typically associated with Kawasaki's disease, such as significant joint pain or arthritis (which are more characteristic of other conditions like rheumatic fever or juvenile idiopathic arthritis), then it would be the correct exception.

## Clinical Pearl / High-Yield Fact
A key clinical pearl for Kawasaki's disease is the importance of early recognition and treatment to prevent coronary artery complications. The disease is more common in children under the age of 5, and there is a predilection for boys over girls. A high-yield fact is that not all patients present with the classic five criteria, and the absence of one or more criteria does not exclude the diagnosis.

## Correct Answer: D.