Why does seborrheic dermatitis cause an oily scalp?

Seborrheic dermatitis favours parts of the body with many sebaceous glands. These glands release sebum, a normal oily substance that helps condition the skin and hair. In some people, the local balance of oil, skin cells and microorganisms encourages inflammation. Oil can then bind with shed cells, creating a greasy film or yellowish scale rather than a clean, dry flake. Oily Scalp is a very common presentation of Seborrheic Dermatitis, although an oily scalp alone cannot identify its cause.

Clean the scalp as often as needed to remove excess oil without vigorous scrubbing. A gentle shampoo may be enough between uses of a medicated product recommended by a clinician or pharmacist. Work shampoo onto the scalp, rinse fully and avoid applying heavy oils or styling products directly to irritated areas. Do not pick at attached scale; loosening it gently during washing is less likely to injure the skin. Change one product at a time so a reaction is easier to recognise.

Seek medical advice when greasiness comes with persistent redness, thick scale, pain, sores, discharge or significant itch. An appointment is also useful if symptoms continue despite consistent care, repeatedly return, or involve the face and ears. A clinician can check for seborrheic dermatitis and conditions with similar oil-and-scale patterns, then tailor treatment to your scalp.

Ask whether you should wash more frequently, which active ingredient is appropriate, and how to use it safely. Mention any hair products, oils or recent changes, and ask how to tell normal oiliness from inflammation that needs treatment.