Poor Hygiene and an unsanitary surgical environment or surgical tools to be used
You can get infected if your surgeon uses unsanitized tools or equipment to perform the surgery. Also, if the hair transplant surgery is done in an unsanitary surgical environment, the procedure should be done in a clinic or hospital that has good hygiene standards and is well sanitized. This is to reduce the risk of bacteria entering your open wounds during the hair transplant or while your wounds are healing.
You can also be the cause of the infection yourself if you touch your scalp wounds while they heal, especially if your hands are not clean and sanitized. Bacteria can transfer your fingertips to the treatment sites.