A punch biopsy is a minor procedure and only takes a few minutes:

• Local Anaesthetic is injected into the skin.
• A small skin sample is taken using a punch biopsy blade and sent for
  Pathology
• The biopsy site is covered with a small dressing for 24 hours. Small
  band aids are then used and replaced every 1-2 days up to a week.
• A small suture may be required only if there is excessive bleeding
• Over time, the biopsy site shrinks in size. It usually heals by 1-2 weeks.