• A chronic, inflammatory skin disorder that affects the scalp, central face and skin folds; it is characterized by scaling and itching.
  NCI
  U.S. National Cancer Institute, 2021
• A mild and common condition that is characterized by an itchy, flaky scalp and that may extend to the ears, face, and chest. Also known as dandruff.
  Harvard Dictionary of Health Terms
  Harvard Medical Publishing, 2011
• Seborrheic dermatitis is a form of eczema which is closely related to dandruff. It causes dry or greasy peeling of the scalp, eyebrows, and face, and sometimes trunk.
  Human Phenotype Ontology (HPO)
  The Human Phenotype Ontology Project, 2025
• (dermatitis, seborrheic) A chronic inflammatory disease of the skin with unknown etiology. It is characterized by moderate ERYTHEMA, dry, moist, or greasy (SEBACEOUS GLAND) scaling and yellow crusted patches on various areas, especially the scalp, that exfoliate as dandruff. Seborrheic dermatitis is common in children and adolescents with HIV INFECTIONS.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• Seborrheic dermatitis is a common inflammatory condition of skin regions with a high density of sebaceous glands (eg, face, scalp, sternum). The cause is unknown, but species of Malassezia, a normal skin yeast, play an important role. Seborrheic dermatitis occurs with increased frequency in patients with HIV and in those with certain...
  Merck Manuals
  Merck & Co., Inc., 2025
• Seborrheic dermatitis is a papulosquamous disorder patterned on the sebum-rich areas of the scalp, face, and trunk (see the image below). In addition to sebum, this dermatitis is linked to Malassezia, immunologic abnormalities, and activation of complement.
  Medscape
  WebMD, 2025
• Seborrheic (seb-o-REE-ik) dermatitis is a common skin condition that mainly affects your scalp. It causes scaly patches, red skin and stubborn dandruff. Seborrheic dermatitis can also affect oily areas of the body, such as the face, sides of the nose, eyebrows, ears, eyelids and chest.
  Mayo Clinic
  Mayo Foundation for Medical Education and Research, 2025
• Seborrheic dermatitis (SD) is a common inflammatory skin disorder that usually manifests as erythema and scaling of the scalp, nasolabial folds, glabella, and occasionally central face and anterior chest. It tends to worsen with stress. In infants, SD may manifest as scaling of the scalp and is termed cradle cap.
  Epocrates
  Athenahealth, Inc., 2019