Condition
A chronic, sebum-rich-area inflammation associated with Malassezia yeasts and barrier dysfunction.
Seborrheic dermatitis appears in sebum-rich areas — scalp, eyebrows, nasolabial folds, chest — and tends to relapse.
Lipid-loving Malassezia yeasts metabolize sebum lipids, releasing fatty acids that can trigger an inflammatory and barrier response in susceptible skin.
It is not contagious and is not caused by poor hygiene. Antifungal axes and barrier care address different parts of the same chain.
Mechanism axes
Each card opens the mechanism page and connects to related ingredients and conditions.
Lipid mixture produced by sebaceous glands; substrate for both barrier function and microbial activity.
Lipophilic yeasts associated with seborrheic dermatitis and other sebum-rich skin presentations.
Stratum corneum + lipid matrix that controls water loss and limits irritant entry.
Innate immune response producing redness, swelling, and discomfort in affected skin.
Visible shedding of stratum corneum, often accelerated in seborrheic dermatitis and dandruff.
Pruritic sensation from inflammatory mediators acting on cutaneous nerves.
Visible erythema from vasodilation and inflammation in affected skin.
Ingredient axes
Ingredients commonly discussed in clinical literature in relation to these mechanisms.
Antifungal / Malassezia axis
An imidazole antifungal commonly discussed in seborrheic dermatitis and dandruff guidelines.
Antifungal / Malassezia axis
An antifungal and keratolytic agent commonly discussed in dandruff and seborrheic dermatitis literature.
Antifungal / Malassezia axis
An antifungal and antibacterial agent commonly discussed in scalp seborrheic dermatitis.
Skin barrier axis
Formulations supporting the lipid barrier and reducing transepidermal water loss.
Misconceptions
Claim
“Dandruff means dry scalp.”
Mechanism reality
Seborrheic dermatitis flakes are typically greasy and tied to sebum-rich zones, not dehydration.
Claim
“It is caused by poor hygiene.”
Mechanism reality
It is associated with Malassezia colonization and host response, not cleanliness.
Claim
“Antifungal shampoos 'kill dandruff forever'.”
Mechanism reality
It is a chronic, relapsing condition. Long-term management cycles are common.
Science Layer
Manually curated links to public scientific resources — AlphaFold DB, UniProt, Open Targets, PubMed. Not real-time predictions, not treatment guidance.