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Even if it is a hairline crack, it needs no special intervention - it heals with time.
is just behind the inner aspect of the elbow - probably it got hit and could cause this - generally it also heals by itself.
In the mean time, till you could see your doctor -
Rest the part
Use Cold compress (ice bag)
You can try NSAID
- Non Steroidal Anti Inflammatory Drugs like Ibuprofen
(available Over The Counter). If very severe, tramadol
will help in pain relief - they need prescription from your GP
Wishing speedy recovery