What are these erythematous patches on her fingers and toes?

Minnie, aged six, attends with tender, erythematous, shiny patches affecting her finger and toe pads, as well as her heels, that have been present for five days.

Minnie is otherwise well, with no past history of note.

She has been eating and drinking as usual and has continued to happily play with her neighbours in their backyard pool for 1-2 hours a day, as she has done most days since the start of the school holidays, 10 days ago. 

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