Perimenopause facial hair is rarely a testosterone surge. Falling estrogen lowers SHBG, the protein that binds testosterone, so more of it reaches chin and upper-lip follicles. Cathy unpacks the research behind that ratio shift, how to tell it apart from PCOS, the red flags that need a doctor, and which methods suit which hair and skin, from threading and laser to electrolysis and eflornithine cream.