Ive been reading on a lot of other people's posts about having dry/itchy scalp due to accutane. Here is some intresting stuff about dandruff
Dandruff particles are visible flakes of skin that have been continuously shed from the scalp. It is normal to shed some dead skin flakes as the skin is constantly renewing itself. The new cells form in the lower layers. They are gradually pushed to the surface as more new cells form beneath them. By the time they reach the surface, the cells have become flat and overlap each other like roof tiles. By then, these cells are dead and are shed from the surface all the time. They are so small that we do not notice this is happening.
With dandruff, this whole process of skin renewal (or skin turnover) speeds up, so a greater number of dead cells are being shed. Also, the cells are shed in clumps, which are big enough to be seen with the naked eye as embarrassing flakes, especially when they land on dark clothing. The scalp may also feel slightly itchy.
Dandruff is very common. According to Proctor and Gamble, it affects more than 50% of the population of the USA â€“ so it is more common to have dandruff than not! It can occur at any age, but is most likely in the early 20s http://www.embarrassingproblems.com/problem/dandruff