Excess oil
A scalp that feels greasy within a day of washing. Often treated with increasingly harsh products, which is usually the wrong direction.
01 What it is
Sebum is produced by glands attached to the follicle and is not the enemy, it protects skin and conditions hair. Some people simply produce more of it, and how oily a scalp appears also depends on hair density, texture and how much is being redistributed by touching and brushing.
Where it becomes a problem is when oil accumulates with scale and product, when it comes with inflammation, or when it drives a washing routine so harsh that the scalp and hair suffer for it.
02 Recognition
What people usually notice
- Hair that looks flat and separated at the roots within a day.
- A scalp that feels coated, sometimes with an odour by the end of the day.
- Oiliness together with flaking. A very common combination and a meaningful one.
- A cycle of washing more often, using stronger products, and it getting no better.
- Ends that are dry and brittle while roots are greasy.
03 Contributors
What may contribute
Grouped by how well supported each one is. That distinction matters more than the list itself.
Well established
- Individual variation in sebaceous gland activity, much of it genetic.
- Androgen activity, which is why oiliness often changes at puberty, and with some hormonal conditions and medications.
- Seborrhoeic dermatitis, which frequently occurs alongside an oily scalp.
Commonly associated
- Over-washing with harsh detergents, followed by a rebound feeling of greasiness.
- Heavy conditioners and oils applied at the root.
- Frequent touching, brushing and dry shampoo layering.
- Hormonal changes, including some contraceptives.
Debated or unsupported
- “Training” the scalp by not washing for extended periods, the evidence for a lasting reduction in sebum production is not there, and for an inflamed scalp it can make things worse.
- Sebum as a direct cause of hair loss. Scalp inflammation matters; oil by itself is not the mechanism it is often claimed to be.
04 Uncertainty
What we don’t know
- How much washing frequency genuinely influences long-term sebum production, as opposed to how the scalp feels day to day.
Worth doing first
When to bring a doctor in
- If oiliness is accompanied by significant inflammation, soreness or hair loss.
- If it changed suddenly and markedly, particularly alongside other hormonal symptoms.
- If there are also irregular periods, acne or unusual hair growth, worth investigating.
If any of this applies, see a doctor first. It’s the quickest way to an answer. Bring what they tell you back to me and we’ll work out what it means for you.
05 Consultation
What a consultation can explore
- The washing routine in detail, including products, water temperature and technique.
- Whether inflammation or scale is present as well as oil.
- What has been tried and what effect it actually had.
- Whether hair is being damaged by the routine used to manage the oil.
- A gentler approach that is sustainable rather than corrective.
Most oily scalps are managed by washing well rather than by washing harshly. The distinction matters.
What happens next
Book
Online, wherever you are. You’ll receive a questionnaire and a prep sheet, and I read both before we meet.
We look at it properly
History, assessment, findings, and time for the questions you came with.
You get it in writing
A summary you can act on, sit with, or hand to your doctor.
This page describes what people commonly experience. Reading it isn’t the same as having someone look at your situation properly, and it can’t tell you which of these you have. That’s what the consultation is for.
Sources and further reading
- DermNet Seborrhoea
- DermNet Seborrhoeic dermatitis
- NHS Dandruff
Written by Brigita Deveikaite, certified trichologist (VTCT Skills (ITEC) Level 4 Certificate in Trichology for Hairdressers, Trichocare). Last reviewed . This page is educational and is not a diagnosis.