Circumcision involves removal of foreskin. It is done both for religious and health reasons. Circumcision avoids chances of infection called Balanitis and is also shown to reduce chances of penile cancer. It is done under local anaesthesia on day care basis. It does not require suture removal and is painless.
Frenulum is a band extending from the lower aspect of penis. In some men it can be tight (Even after circumcision) and lead to discomfort. It can be corrected by a simple procedure under local anaesthesia.