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| Type | Histopathology | IgE | Heat induced pain or urticarial |
|---|---|---|---|
| Sweat gland dysfunction | inflammation around eccrine glands | normal | Absent |
| Idiopathic pure sudo- motor failure |
normal | ↑ | pain and/or urticaria |
| Sudomotor neuropathy | ↓VIP-positive nerve endings around sweat glands |
normal | Absent |
