1. What Is Scalp Sebum?
Sebum plays a key role to lubricate, coat and protect your scalp and hair. It is an oily, waxy substance secreted by sebaceous glands that are often grouped around hair follicles. Many factors can change sebum secretion, and both sebum deficiency and increased sebum production can cause concerns. On one hand, sebum secretion decreases as we age. But malnutrition and starvation, and some medications, e.g., birth control pills, can also reduce sebum production. Insufficient sebum can lead to dry and cracked scalp. On the other hand, hormone changes, for example increase of sex hormone, and some hormonal medications can lead to increased sebum production. Inflammations develop when excessive amount of sebum and dead skin cells plug hair follicles.To assist diagnosis of scalp sebum, we provide absorbent sebum strips to tag your scalp.
Figure 1. Scalp sebum strips
Press the sebum strip moderately onto scalp in hair parting area for 10 seconds, remove sebum strip and take an image with the PPL light mode of our Chowis Hair Analyzer. Our algorithm then evaluates the sebum spots in the image and provides the grading.
2. Chowis Scalp Sebum Grade
The following CHOWIS scalp sebum grade has been co-developed by CHOWIS and dermatology experts. For each image, we detect sebum to provide a quantified score. Based on the scale shown in Table 1, we grade scalp sebum into very dry, dry, normal, oily, and very oily.
| Grade | Scale | Description |
|---|---|---|
| Very dry | 0~5 | Dry scalp with really low sebum secretion. |
| Dry | 6~15 | Scalp with mildly low sebum production. |
| Normal | 16~48 | Normal scalp with balanced sebum secretion |
| Oily | 49~80 | Scalp with mildly increased sebum production. |
| Very oily | 81~99 | Oily scalp with highly excessive sebum secretion. |
| Very dry |  |
| Dry |  |
| Normal |  |
| Oily |  |
| Very oily |  |