Seborrhoeic Dermatitis
Seborrhoeic dermatitis is a common inflammatory skin condition affecting areas with high concentrations of sebaceous glands — primarily the scalp, face (eyebrows, nasolabial folds, around the ears), and upper chest. It is characterised by redness, greasy-looking flaking, and mild to moderate itching.
The condition is closely associated with Malassezia yeast — a normal skin commensal that overgrows when the sebaceous environment is disrupted. This is not an infection, but an inflammatory response to Malassezia-derived fatty acids that damage the skin barrier.
How peat may help
Antimicrobial action. Humic acids and phenolic compounds in peat have demonstrated activity against Malassezia species in vitro. This is not antifungal action in the classical pharmacological sense, but rather a modulation of the scalp microenvironment that may make it less hospitable to Malassezia overgrowth.
Anti-inflammatory action. Reducing the inflammatory response to Malassezia metabolites is as important as addressing the yeast itself. Peat’s anti-inflammatory properties work alongside, not instead of, microbiome management.
Sebum adsorption. Peat is an effective adsorbent — it binds oils, metabolic waste, and cellular debris. Regular use of peat-based scalp care may help manage the sebaceous excess that fuels Malassezia overgrowth.
Practical applications
- Peat shampoos — the most practical format for scalp seborrhoeic dermatitis; look for products combining peat with zinc pyrithione or selenium sulphide for additive effect
- Peat scalp masks — weekly application may provide more sustained benefit than rinse-off shampoos alone
- Peat face masks — for seborrhoeic involvement of the face (forehead, nasolabial area)
Distinguishing from dandruff
Dandruff (pityriasis capitis) and seborrhoeic dermatitis share the same underlying biology but differ in severity. Dandruff is limited to the scalp and is primarily cosmetic in nature; seborrhoeic dermatitis involves inflammation and may extend beyond the scalp.
Both may respond to similar peat-based approaches, but seborrhoeic dermatitis affecting the face or causing significant inflammation warrants dermatological assessment.
Disclaimer: Consult a dermatologist for diagnosis and treatment of persistent or severe seborrhoeic dermatitis.
See also: Dandruff · Peat and scalp health