seconding the person who said cetaphil but im personally a cerave girly (both are good!) depending on your skin needs and your skin type. since you mentioned acne:
-cerave acne foaming cream cleanser (has benzoyl peroxide but idk if his skin is sensitive)
-other acne helpers: retinoids, salicylic acid, benzoyl peroxide, azelaic acid (paulas choice)
-i heard laroche posay is also good too
def do some research on combinations that are good vs combos to avoid (dont use retinoids w vit c or bpo for example) but my fav youtuber for skincare is doctorly!
re: dandruff, even if you shower everyday it may be worse for your dandruff if your skin is super dry and flaky-- listen to your body and hair! if you need the oils vs if you need the cleanse, its different for everyone
otber than nizoral i heard T/Gel was good for dandruff? and coconut oil goes a long way :)

So insane but I need shampoo, hair, skin recs, my hair has fallen due to a disease, and I have seborrheic dermatitis.
My hair is super thin, to the point that I am self conscious about it. Its so uneven, and has hela dandruff( even though I shower regularly) I tried what the derm has recommended (which is a kel shampoo and cream) but it hasnt really helped much. Things is, im super self conscious about my skin and hair and i need something to help my hair grow faster and thicker. And I need some ointment, or skin treatment for my face and arm, PLEASE HELP!