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Seborrheic dermatitis is a common skin condition that mainly affects your scalp (dandruff) and can be really frustrating for those that experience it.
The skin condition causes a notoriously itchy scalp, which, when scratched, can then cause tiny flakes of skin to fall onto your shoulders and around the neck. If you happen to be wearing a dark-colored top, then you can expect this to show up rather obviously -- and can be noticeable under a UV light!
Other than that white flaking, itching is arguably the most uncomfortable side effect that comes from dandruff, but what exactly is your scratchy scalp trying to tell you?