Hi My 1 year old showed up with this blister that at night became even more red …

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Hi My 1 year old showed up with this blister that at night became even more red from childcare yesterday they said that they have no idea what hapenned. Can anyone guess what this could be? She does not have any other symptom ( no fever, no pain, eats well). Thanks anything I can put on it? Pic in comments
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