AT the site of entry of nail,the skin layers might have damaged and became hard.
will be formed at the sites.
injection prevents Tetanus disease which has to be taken 1-2 days after trauma.Tetanus disease will be manifested 10 days after trauma.As one year has passed,Tetanus will not occur.
You can get the hard thing excised under local anaesthesia.
Nothing to worry
Wish you good health