"inflammation of skin in areas rich in sebaceous glands.
Hence common onface
scalp and chest.
Nothing to do with seborrhoea (oily skin).
'dandruff' = non-inflamed form of seborrhoeic dermatitis of scalp
Symptoms maybe aggravated by drugs.
Can be a manifestation of ANS dysfunction in PD.
Seborrheic dermatitis is associated with increased risk of PD.
Cause: ? Fungal ? Autoimmune"