research How Many Sessions Are Required for Scalp Micropigmentation March 2021 Scalp micropigmentation usually needs two to three sessions, but factors like genetics, coverage area, and health conditions can require more.
research Complications and Difficult Cases: A Neurosurgeon’s Perspective on Hair Restoration Surgery November 2014 in “Hair transplant forum international” Hair restoration surgery in patients with prior neurosurgery or radiation treatment can have risks like infection and poor wound healing, so it's important to discuss these with the patient.