Sebaceous filaments are structures that allow sebum to flow to the surface of the skin. Tiny glands beneath the skin create sebum, which is an oily substance that helps lubricate the skin. When the ...

Medically reviewed by Marisa Garshick, MD Wet dandruff symptoms may worsen with hormonal changes, stress, or cold, dry weather. Diagnosis involves checking the scalp for flaking, oiliness, and redness ...