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How did I get these finger prints on my arm?

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I woke up today and everyone at my house noticed these finger print bruises on my arm. I haven't been anywhere or anything, all I did was sleep. My sister came over and put her hand around my arm and the prints line up perfectly as if someone grabbed me. Nobody has grabbed me though, I woke up with it.

My mom wont get off my case, she's like "you better tell me who did this" and I don't know what to tell her because nobody has grabbed me. I'm confused :( She usually takes my word but this just doesn't make sense to her and I told her I'd tell her if someone ever grabbed me and she's like "you better tell me"

How do I have these finger marks clearly bruised into my arm as if someone grabbed me, and prints patch up to fingers perfectly?