**Core Concept**
Cutis marmorata is a harmless, temporary condition characterized by a mottled or marbled appearance of the skin, typically in response to cold exposure. It results from the constriction of superficial blood vessels, leading to an uneven distribution of blood flow.

**Why the Correct Answer is Right**
Cutis marmorata occurs due to the cold-induced vasoconstriction of the small blood vessels in the dermal layer of the skin. As the blood vessels constrict, the skin appears mottled or marbled due to the uneven distribution of blood flow. This condition is usually seen in infants and young children, as their skin is more sensitive to cold temperatures.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the pathophysiology of cutis marmorata. While certain medications can cause vasodilation or vasoconstriction, they are not typically associated with cutis marmorata.

**Option B:** This option is incorrect because cutis marmorata is not a sign of an underlying systemic disease or infection. It is a benign, self-limiting condition that resolves once the individual is rewarmed.

**Option C:** This option is not correct because cutis marmorata is not caused by exposure to heat or warm temperatures. In fact, the condition is more commonly seen in cold environments.

**Clinical Pearl / High-Yield Fact**
Cutis marmorata is often seen in infants and young children, as their skin is more sensitive to cold temperatures. It is a harmless condition that resolves once the individual is rewarmed.

**Correct Answer:** B. Cold exposure