|"Is this all real? Or has this been happening inside my head?"
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Chicken pox is a highly contagious illness caused by a viral infection. It usually starts with skin rash, mainly on the torso and head rather than the extremities, and becomes itchy and raw pockmarks, which mostly heal without scarring.
In 1938, Billy Stubbs and Eric Whalley developed chicken pox at Wool's Orphanage. Mrs. Cole, the matron, told one of her helpers to take the iodine to Martha, so that she could disinfect their pockmarks.
- Harry Potter and the Half-Blood Prince (Mentioned only)