Do not use castor oil on an open biopsy wound, especially when basal cell carcinoma is diagnosed and Mohs surgery is planned.
Open wounds need to stay clean and sterile Oils can trap bacteria, delay healing, and increase infection risk It may interfere with proper wound assessment before Mohs surgery
What to do Clean gently with normal saline or clean water Apply plain petroleum jelly (Vaseline) or the ointment prescribed by your doctor Cover with a clean dressing Keep the area dry and protected


