Crazy dandruff?? or seb derm

Hi yall, I started washing my boyfriends hair a year ago ( because I enjoy it and he has great hair ) but since July he’s been having pretty bad dandruff. He moved to Japan last year and switched up his products but I would intermittently make him use Nizoral and it was doing super well until July. Now it feels like super dandruff where I have to scrape off the scalp, shake it out and then wash it.

I tried Nizoral (leaving it in for 10 minutes while washing), drying immediately with a blow dryer and using only MCT Oil (the brand without lauric acid) and it’s still pretty bad. For the first 1-2 days after the wash its fine but day 2-3 it gets bad again. His old routine when he was back at home was wash 1x a week and put in a bunch of oils and it always worked for him (he’s from a tropical country). I don’t know if it’s the Japanese water or products (we even bought a shower filter) that made it so bad. He’s been in the U.S. since august and I’ve been washing his hair more frequently but I’m getting worried. He doesn’t have insurance here to go to a dermatologist yet so any suggestions? I noticed that if its wet for too long after the shower without drying then the dandruff is worse. Is scraping the scalp doing more harm than good?

Hi yall, I started washing my boyfriends hair a year ago ( because I enjoy it and he has great hair ) but since July he’s been having pretty bad dandruff. He moved to Japan last year and switched up his products but I would intermittently make him use Nizoral and it was doing super well until July. Now it feels like super dandruff where I have to scrape off the scalp, shake it out and then wash it.

I tried Nizoral (leaving it in for 10 minutes while washing), drying immediately with a blow dryer and using only MCT Oil (the brand without lauric acid) and it’s still pretty bad. For the first 1-2 days after the wash its fine but day 2-3 it gets bad again. His old routine when he was back at home was wash 1x a week and put in a bunch of oils and it always worked for him (he’s from a tropical country). I don’t know if it’s the Japanese water or products (we even bought a shower filter) that made it so bad. He’s been in the U.S. since august and I’ve been washing his hair more frequently but I’m getting worried. He doesn’t have insurance here to go to a dermatologist yet so any suggestions? I noticed that if its wet for too long after the shower without drying then the dandruff is worse. Is scraping the scalp doing more harm than good?