I’m really glad you shared the photo — this looks serious and painful, especially for a child 😟 From what I can see, it looks very similar to a blood blister (a blister filled with blood instead of clear fluid). These can become large and dark when pressure or trauma happens while sleeping (for example from tight shoes the day before, friction, or a small injury that wasn’t noticed). However, because of the size, dark color, and strong pain, it could also be something more serious like: a deep foot abscess a severe infected blister or in rare cases, a...
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