Dry Scalp vs. Oily Scalp: How Your Scalp Type Shapes Care Design and the Role of Stem Cell Conditioned Media, Explained by Dr. Moriwaki2026.07.17

“Even when using the same shampoo, scalp condition varies dramatically from person to person” — this is a common observation in our clinic. Some patients feel tightness from dryness, while others notice greasiness by the evening or repeated flaking. The framework that helps organize these differences is the concept of the scalp type. Choosing over-the-counter scalp care without correctly identifying your scalp type can actually disturb the scalp barrier and increase the risk of hair thinning. In this article, we focus on the differences between dry and oily scalps, examine how to classify and identify each scalp type, and honestly review what stem cell conditioned media can offer as a complementary approach — from Dr. Moriwaki’s perspective.

Key Points of This Article

・Scalp type is best understood in four categories: dry, oily, combination, and sensitive — this makes daily care design far more consistent

・Observing your scalp 6–8 hours after washing is the most practical measure for identifying your scalp type

・A shampoo mismatched to your type can disturb the scalp barrier and microbiome, potentially raising thinning risk

・Stem cell conditioned media acts on the follicular microenvironment regardless of type and can serve as a complementary option

・Because scalp type shifts with season, lifestyle, and age, reassessment every 6–12 months is advisable

What Is Scalp Type — Four Categories Based on Sebum and Barrier Function

Scalp condition becomes easier to understand when organized along two axes: sebum secretion and barrier function. Low sebum secretion with reduced moisture retention describes the dry type; excessive sebum secretion describes the oily type; regional differences describe the combination type; and heightened reactivity to stimuli describes the sensitive type. Determining which of these four categories fits you is the starting point for building both daily care and medical strategies.

Physiological Differences Between Dry and Oily Scalps

In the dry type, stratum corneum moisture content is low and the sebum film is thin. The weakened barrier reacts more readily to external stimuli, producing flaking, itching, and tightness. In the oily type, sebaceous glands are highly active, and the scalp surface becomes coated with sebum over time. Sebum itself protects the scalp, but when excessive, it oxidizes and induces microinflammation around the follicles. This microinflammation may disrupt the hair cycle and contribute to follicular miniaturization, and has recently gained attention as a risk factor for AGA progression.

Combination and Sensitive: The Often-Overlooked Categories

The combination pattern is mixed — oily at the crown but dry at the temples and back. It is relatively common among Japanese and cannot be captured by “dry or oily” alone. The sensitive type shows heightened reactivity to chemical and physical stimuli due to a weakened barrier, with chronic redness, stinging, or itching. Viewing scalps through this four-category lens explains why the same shampoo produces such different results across individuals.

scalp type dry oily hair regenerative medicine

How to Identify Your Scalp Type: A Practical Self-Check

Observe Your Scalp 6–8 Hours After Washing

The simplest method is to observe your scalp 6–8 hours after shampooing. Press a tissue gently against the scalp and check the amount of sebum transferred. If very little oil is picked up and there is a powdery feel to the touch, you may fall into the dry category. If oil clearly transfers to the tissue and a sheen remains, the oily category is likely. When only the frontal area feels greasy while the sides stay dry, a combination pattern is suspected.

Account for Seasonal and Lifestyle Variation

Scalp type is not fixed; it fluctuates with season, lifestyle, and hormonal balance. It tends toward dryness in winter and toward oiliness in summer and the rainy season. Periods of high stress, sleep deprivation, or specific phases of the menstrual cycle can push scalps toward the oily side. Rather than judging from a single check, reassessing across seasons and health changes is more practical. For clinical guidelines on scalp disorders and AGA, please also refer to the Japanese Dermatological Association and continue to observe your own scalp regularly.

Category-Specific Care Design and Stem Cell Conditioned Media as Complement

The Approach Needed for the Dry Type

For the dry type, the first step is to avoid overly aggressive shampoos and choose mild amino-acid or amphoteric-based cleansers. Washing frequency should be limited to about every other day, with water temperature around 38°C. A moisturizing scalp lotion can also be useful to help retain stratum corneum moisture. Applying strong topicals or mechanical stimulation when the barrier is weakened may in fact provoke inflammation, so caution is warranted. In dry-type hair regenerative medicine, delivering stem cell conditioned media to the scalp after preparing the environment is a realistic complementary approach.

How to Approach Oily and Combination Types

For the oily type, the mindset should be to “balance” sebum rather than to “strip it away.” Excessive degreasing can trigger a rebound that further promotes sebum secretion. Once-daily appropriate washing and careful pre-rinsing are foundational, and antioxidant scalp tonics that suppress microinflammation from oxidized sebum are also an option. For combination scalps, adjusting care intensity by region is realistic. Because stem cell conditioned media acts on the follicular microenvironment regardless of scalp type, it can serve to elevate the overall scalp environment after basic care is optimized. For more on our treatment philosophy, please see the related columns on hair regenerative medicine.

Summary

Organizing scalp condition into four categories — dry, oily, combination, and sensitive — makes daily care and medical approaches much easier to plan. Identifying your scalp type first, then designing shampoo choice, wash frequency, moisturization, and injection therapy layer by layer, provides the foundation for thinning prevention and effective hair regenerative medicine. A one-size-fits-all approach can even accelerate thinning by disturbing the barrier. Reviewing your scalp type may well be the first step in hair regeneration.

Frequently Asked Questions

Q. Can scalp type change in adulthood?

It shifts with age, hormonal changes, and lifestyle. Even those who tended toward oily in youth often migrate toward dry after their forties. Reassessment every 6–12 months is recommended.

Q. What are the risks of continuing a shampoo that doesn’t match your type?

If cleansing is too strong, the scalp barrier and microbiome can be disturbed; if too weak, microinflammation from oxidized sebum can develop. Over the long term, worsening follicular environments can accelerate hair thinning, so reviewing based on scalp type is important.

Q. Can stem cell conditioned media be used for both dry and oily scalps?

As a complex of growth factors and cytokines, stem cell conditioned media can act on the follicular microenvironment regardless of category. However, pre- and post-procedure care and delivery technique need to be adjusted for each scalp type. Because individual response varies, discuss with your treating physician.

Q. Can I accurately determine scalp type at home?

The 6–8-hour post-wash tissue check is a useful rough guide, but for greater precision, we recommend a microscope-based scalp examination. Sebum amount, pore condition, hair diameter, and blood flow can be objectively evaluated.

Q. Where should combination category start when trying to improve?

First regulate sebum control in the crown and other oily-prone regions, then build up moisturization for the drier temples and back. Rather than trying to standardize everywhere at once, focus on region-by-region intensity adjustment.

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Supervising Physician: Shin Moriwaki, MD

Member, Japan Society of Aesthetic Surgery (JSAS) / American Academy of Aesthetic Medicine

ECFMG certificate (U.S. medical licensure qualification)

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📍AVAN TOKYO 銀座毛髪再生医療

AVAN TOKYO Ginza Hair Regenerative Medicine

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