lub po prostu excessive dandruff

Proszę zerknąć na dandruff definition:

This term is commonly used to describe a condition where small flakes of the skin that have flaked off can be noticed. A variation of this condition is "Large flaky dandruff", where the flakes are larger. One can insist on some very literal translation like "profuse small flaked scalp skin flaking", but this profuse flaking is simply "dandruff", as was wisely answered before me.