Is Lump Removal Surgery Advisable When Undergoing Blood Transfusions?

Hi. My dad has been living on blood transfusion for over 3 years. Hospitals, where he lives in Nigeria are not able to diagnose what type of blood disease he has. They, also, could not carry out a biopsy to find out if he has leukemia or the like. Recently, a lump was noticed on his chest. So my question is: Is it safe for him to have the lump taken out and examined for cancerous cells? My dad is weak and his system is weak so I m sceptic about him having any form of medical operation. And I also don t know if irritating the lump will cause complications, break out of more lumps, etc.