Ideas to help my 2 1/2-year-old not pick at a scab?

My kid did a face plant in a parking lot and scrapped up her chin last week. She keeps picking it the scab, causing it to bleed. Does anyone have any ideas to get her to stop picking at it? I've tried bandages over it (she removes them), talking to her and wishful thinking. Any other strategies that I should try?
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