## **Core Concept**
Meningococcal meningitis, caused by *Neisseria meningitidis*, can present with skin lesions due to the bacterium's ability to cause disseminated infection. This condition often results from the spread of the bacteria into the bloodstream, leading to a condition known as meningococcemia. The skin manifestations are a critical clue to the diagnosis.

## **Why the Correct Answer is Right**
The correct answer, petechiae or purpura, are skin lesions caused by the endotoxin-mediated damage to the blood vessels in the setting of meningococcemia. This damage leads to the leakage of blood into the skin, resulting in characteristic non-blanching rashes. The lesions can range from small petechiae to large purpuric patches. This occurs due to the **endotoxin** of *Neisseria meningitidis*, which causes vascular injury.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While cellulitis is a skin infection, it is not typically associated with *Neisseria meningitidis* as a primary manifestation. Cellulitis is more commonly caused by streptococci or staphylococci.
- **Option B:** Urticaria, or hives, are not a characteristic skin finding in meningococcal infections. Urticaria is more commonly associated with allergic reactions.
- **Option C:** Vesicles are small blisters that can be seen in various viral infections, not typically in bacterial infections like meningococcemia.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the presence of **petechiae or purpura** in a patient with fever and signs of meningismus (such as neck stiffness, headache, and altered mental status) should prompt immediate investigation for meningococcemia and meningitis. Early recognition is crucial for timely antibiotic intervention.

## **Correct Answer:** D. Petechiae or purpura.