Flushed skin is caused by which vascular change?

• A. Dilation of superficial blood vessels
• B. Constriction of superficial blood vessels
• C. Thickening of capillary walls
• D. Obstruction of venous return

Answer: (A)

Flushed skin results from dilation of superficial cutaneous vessels. When the small arteries and arterioles near the skin’s surface widen, more blood flows through the skin, producing a red, warm appearance. This vasodilation is driven by signals like nitric oxide during heat exposure, inflammation, or certain emotional states, and it increases surface blood flow, giving that flushed look.

Constriction would reduce surface blood flow, leading to pallor rather than redness. Thickening of capillary walls can impair or alter perfusion but doesn’t produce a bright flush. Obstruction of venous return causes pooling and a dusky or swollen appearance, not a fresh red flush.