Sebum & blemishes · Entry 05
Excess sebum
Sebum is not the enemy: it is part of the film that keeps water in the skin. The aim is regulation, not removal — because stripped skin usually answers by making more.
- How it reads
- Shine by midday, and enlarged pores through the centre of the face.
- Mechanism
- Sebaceous gland sensitivity, often with reactive seborrhoea
- Honest timeline
- Six weeks to visible regulation — and it gets worse before better if you have been stripping
- Often arrives with
- Blemishes · Dehydrated skin
Processes involved
The biology
underneath
- Sebaceous gland signalling5-alpha-reductase converts testosterone to DHT inside the gland. Local sensitivity, not circulating hormone level, decides how much sebum a given face makes.
- Reactive seborrhoeaRemoving the surface lipid film raises water loss sharply, and the gland responds to that signal by producing more. This is the mechanism behind oily-after-cleansing.
- Pore architectureEnlarged pores are follicular openings held open by sebum volume and weakened surrounding collagen. Regulation shrinks the appearance; nothing closes a pore.
Why it happens
- Androgen sensitivity of the sebaceous gland, which is largely inherited.
- Reactive seborrhoea after stripping cleansers or alcohol toners.
- Dehydration, which the gland reads as a signal to compensate.
- Heat and humidity, which raise output measurably and seasonally.
When to see someone else
A sudden change in sebum output — especially alongside hair loss or a change in cycle — is worth a medical conversation rather than a new cleanser.
What has evidence here
Each active carries its own entry in the library, with mechanism, origin and the products it appears in.
- NiacinamideBiotech5.0%The only widely evidenced topical that reduces sebum output rather than absorbing it after the fact.See the ingredient
- Zinc PCABiotech1.0%Works on the enzyme rather than the symptom, and holds water while it does.
- Rosemary extractGrown · Transylvania1.5%Astringent without alcohol, which is the whole trick with an oily skin that is also dehydrated.See the ingredient
- Lavender hydrosolGrown · Geacawater phaseReplaces the alcohol most mattifying formulas lean on — the same finish, without the rebound.See the ingredient
Recommended ritual
Ritual de echilibru
Three steps, and no clay mask more than once a week. The fastest route to less shine is a gentler routine, which is the opposite of what most people try first.