[Product Request] please help me solve the hyperpigmentation under my chin and cheek area!!!

i don’t know when this started. for the past month i’ve tried kojic soaps and vitamin c serums to no avail. i exfoliate 2-3 times a week. i cleanse every day. i shave safely and smoothly when i do. does anyone know what’s going on and how i can fix this? it’s severely tanking my mental health and self esteem 😢😢😢