Seborrheic Dermatitis is a common, chronic, papulo-squamous skin disease and is triggered by yeast (Pitydrosporum yeast). It can occur concomitantly with neurodegenerative disease (eg head injury, spinal cord injury, Parkinsonism , stroke) or those with AIDS. For those with AIDS, seborrheic dermatitis will appear to be more severe.

The affected areas will present with moist, transparent to yellow, greasy and scaling, among coalescing red patches and plaques. It may be diffuse, but mostly seen at scalp margins, central face and presternal areas. Characteristic locations are the eyebrows, the base of eyelashes, nasolabial folds and paranasal skin and external ear canal.