Dear friend, welcome to Healthcaremagic!
I am Dr. Prasad Akole (Critical Care Expert- http://bit.ly/Dr-Prasad-Akole) and am glad to address to
your query here.
If he had punctured a vein but caused pain, there could be a deep hematoma
(blood clot collection) there which could be hurting.
If he had accidentally hit a nerve in attempted venipuncture
and the pain you felt was electric like shooting pain into the forearm on the inner side, it may be a small nerve injury
that is hurting now.
Do not worry. Both will heal and reduce with time. Keep a watch on swelling or discoloration in that area.
I hope to have answered your query satisfactorily. I would be glad to answer any further queries. Take care and please keep me informed of your progress at http://bit.ly/Dr-Prasad-Akole
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