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Trauma to the great toenails can be from a direct blow such as you described, or from jamming of the nail against the toe of footwear during sports. Such trauma often causes bleeding beneath the nail (subungual hematoma). This is what has happened to you. The blood accumulating beneath the nail has obscured the pink nail bed, which is no longer visible through the translucent nail. The nail therefore looks dark bluish-purple. The fluid oozing from under the nail is a mixture of serum and degenerated blood.
Fortunately, the condition is not serious. The hematoma will eventually resolve. The worst possible result would be that the nail has separated enough that it will eventually fall off. A new nail will form beneath the separated nail, and eventually an entire new nail will be formed. This will take a few months. The new nail may not be entirely smooth and uniform. So there may be a somewhat disappointing cosmetic result.
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