The diagnosis is made clinically based on the rash affecting only one dermatome associated with the ophthalmic division of cranial nerve V (trigeminal nerve).

皮疹仅影响一侧皮肤，病灶分布区域与第5对颅神经（三叉神经）的眼神经分支分布区相一致，基于这些临床特点即可作出诊断。

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We're sweating out stress at the gym, too, which also hits the V-spot: Aerobic exercise and yoga enhance vagus nerve output -- as does meditation.

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