We can say that fattening the scalp, ie seborrhea provides the fungus that causes dandruff exactly what it needs, an environment conducive to development; this fungus is lipophilic, meaning it feeds on what is fatty and as long as it has this environment it feels in shape and causes dandruff.
The only solution is to treat yourself with something specific that will kill the fungus and reduce seborrhea. Apply Pon Emo gel 3 times / week for 1-2 months, then as a maintenance treatment once a week.