Changes occurring within the skin

Sebum

Related terms · facial oil · oiliness

Sebum is an oily substance produced by the sebaceous glands that protects the skin surface. Changes in the amount and secretion process can affect the formation of comedones and inflammation.

Reviewed by Korean Medicine Doctor Choi Yeon-seung · Last updated 2026-08-25

Overview

First, look at these three things regarding sebum

  • Sebum is sebaceous glandsan oily substance that comes from the sebaceous glands to protect the skin surface. Changes in the amount and secretion process can affect comedones and inflammation.
  • Having skin that appears oily skin barrierdoes not necessarily mean the skin is healthy. Greasiness and dryness can occur at the same time.
  • Please note down both the greasiness and tightness you feel immediately after waking up, after cleansing, and in the afternoon.

Meaning and Distinction

What is sebum?

Sebum is necessary even for normal skin, and it should not be completely removed simply because there is a lot of it. Sebum is an oily substance that comes from the sebaceous glands to protect the skin surface. If the amount and secretion process change, comedonesit can affect comedones and inflammation.

Easily confused terms
Having skin that appears oily is not the same as having a healthy skin barrier. Greasiness and dryness can coexist.
Why this is checked during medical evaluation
Comedones, heat sensation, dryness, and the effects of topical medication irritationmedications are considered together to determine the intensity of sebum control.
Information to prepare for your visit
Please note down both the greasiness and tightness you feel immediately after waking up, after cleansing, and in the afternoon.

More details

Connecting sebum to my symptoms

Sebum protects the skin, but if it increases or becomes blocked, it leads to acne

Sebum also plays a role in reducing dryness on the skin surface. If you try to remove it all because of greasiness, the skin barrier may be compromised, leading to increased stinging and flaking.

Record greasiness and inner tightness separately

By recording afternoon oiliness, tightness after cleansing, and the number of new inflammatory lesions separately, we can distinguish between sebum issues and barrier issues. In herbal medicine treatment, facial heat sensation and changes in menstruation, sleep, and digestion are also checked.

Frequently Asked Questions

Common questions when looking into sebum

Is a diagnosis determined solely by the term 'sebum'?

Having skin that appears oily is not the same as having a healthy skin barrier. Greasiness and dryness can coexist.

What should I record regarding sebum before my medical evaluation?

We determine the intensity of sebum control by looking at comedones, heat sensation, dryness, and irritation from topical medications. Please note down both the greasiness and tightness you feel immediately after waking up, after cleansing, and in the afternoon.

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Evidence and Update Information

The following materials were referenced to verify the basis and scope of the definitions and treatment descriptions.

  1. NCBI Bookshelf: Sebaceous glands
Summary and review information for this page

Reviewing Medical Staff

Choi Yeon-seung, Doctor of Korean MedicineChief Director · Editor of Korean Medicine Atlas · BRC Researcher

Page Summary

Sebum is an oily substance produced by the sebaceous glands that protects the skin surface. Changes in the amount and secretion process can affect the formation of comedones and inflammation.

What this page covers

What is explained
What should be checked first regarding sebum?
What situations are covered
Sebum is necessary even for normal skin, and it does not all need to be removed simply because there is a lot of it.
What distinctions are made
Difference from similar terms: Appearing to have a lot of sebum is not the same as having a healthy skin barrier. Oiliness and dryness can coexist.
How should this be understood
Changes in the amount and secretion process of sebum can affect comedones and inflammation.

Key Points

  • Meaning of sebum: Sebum is necessary even for normal skin, and it does not all need to be removed simply because there is a lot of it.
  • Difference from similar terms: Appearing to have a lot of sebum is not the same as having a healthy skin barrier. Oiliness and dryness can coexist.
  • Reason for checking during medical evaluation: We determine the intensity of sebum control by collectively assessing comedones, facial heat, dryness, and irritation from topical medications.

References cited on this page

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