**Core Concept**
The question is testing the student's ability to identify a skin condition characterized by neutrophilic infiltration of the dermis, which is a hallmark of a specific type of skin reaction. This condition is often associated with fever and tender erythematous skin lesions.

**Why the Correct Answer is Right**
The correct diagnosis is Sweet's syndrome, also known as Acute Febrile Neutrophilic Dermatosis (AFND). It is a rare skin condition characterized by the sudden onset of tender erythematous skin lesions, fever, and neutrophilic infiltration of the dermis. The exact pathophysiology of Sweet's syndrome is not fully understood, but it is thought to be related to an abnormal immune response, possibly triggered by a viral or bacterial infection. The condition is often associated with the presence of neutrophilic dermatosis, which can be seen on microscopic examination of the skin lesions.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not describe a condition characterized by neutrophilic infiltration of the dermis. Instead, it may describe a condition like psoriasis, which is characterized by a different type of skin reaction.
* **Option B:** This option is incorrect because it does not accurately describe Sweet's syndrome. While it may be a condition that presents with fever and skin lesions, it is not the correct diagnosis.
* **Option C:** This option is incorrect because it does not accurately describe the pathophysiology of Sweet's syndrome. It may describe a condition that is related to an allergic reaction or an autoimmune disease, but it is not the correct diagnosis.

**Clinical Pearl / High-Yield Fact**
Sweet's syndrome can be a challenging diagnosis to make, as the skin lesions can be similar to those seen in other skin conditions. However, the presence of fever and neutrophilic infiltration of the dermis on microscopic examination can help to distinguish it from other conditions.

**Correct Answer:** C. Sweet's syndrome