Case reports: red scrotal syndrome: a localized phenotypical expression of erythromelalgia.

We report a case of red scrotal syndrome responding to oral gabapentin, a neuropathic mediator that is commonly used in the treatment of primary erythromelalgia. The positive response to oral gabapentin and the resemblance of these 2 conditions supports that red scrotal syndrome is a phenotypical expression of localized primary erythromelalgia.