infographic of the norwood scale for male pattern baldness on white background.

hair loss male baldness alopecia skin stages androgenetic type androgen man pattern norwood hamilton scale glabrous bald head scalp root follicle shrink thinning receding hairline thinner shorter decrease reduce removal crown patch temples dermatology diagnose treatment transplant vector flat design infographic age hormone dihydrotestosterone dht genetic problem growth density symptom cause care