Palmoplantar eccrine hidradenitis induced by subacute cold injury: the same entity as childhood pernio?

A 12-year-old healthy female added on urgently to clinic for red, painful feet. Three days prior she developed fever, myalgias, fatigue, diarrhea, nausea and vomiting, and painful red bumps on the feet. All symptoms resolved after two days except foot pain, which progressed. The patient complained of burning, aching foot pain with severe TTP and inability to walk. In the past three weeks she had ridden her horse into a cold river on numerous occasions, most recently two days before her skin eruption. She had no prior history of skin disease. Examination revealed swollen, shiny, tense plantar skin bilaterally with numerous ill-defined bluish-red exquisitely tender nodules and macules on the plantar surfaces and sides of her feet. There was a suggestion of blanching around the lesions. The exam was otherwise normal.