There is a common condition with unclear cause but believed to involve a number of genetic and environmental factors. It is not thought to be related to poor hygiene, and it often worsens during winter. Common signs are scalp itchiness and flakes. What is this condition?

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1. There is a common condition with unclear cause but believed to involve a number of genetic and environmental factors. It is not thought to be related to poor hygiene, and it often worsens during winter. Common signs are scalp itchiness and flakes. What is this condition?