Hair Loss Evaluation by a Dermatologist

Hair loss can appear as gradual thinning, sudden shedding, round bald patches, a receding hairline, or areas of scalp inflammation. Because these patterns can have very different causes, treatment should begin with an accurate diagnosis rather than automatically using supplements, injections, or hair-growth medication.

A dermatologist evaluates both the hair and scalp to determine whether the follicles are still active, whether inflammation is present, and whether the hair loss is likely to be temporary, progressive, or potentially permanent. Effective treatment depends on identifying the cause first.

Common Types of Hair Loss

Possible causes include:

• Male or female pattern hair loss
• Telogen effluvium
• Alopecia areata
• Traction alopecia
• Scarring alopecia
• Hair breakage
• Fungal scalp infection
• Inflammatory scalp conditions
• Medication-related hair loss
• Nutritional or hormonal factors

More than one type may occur at the same time. For example, a patient may have hereditary thinning together with temporary shedding after illness, weight loss, childbirth, stress, or another physical trigger. Telogen effluvium commonly causes temporary excessive shedding after a significant stress on the body.

Hair Shedding vs Progressive Thinning

Hair shedding and hair thinning are not always the same problem.

Excessive shedding often causes:

• More hair in the shower
• Hair collecting on clothing or pillows
• Increased hair coming out during brushing
• General reduction in density
• A relatively sudden change

Pattern hair loss usually develops more gradually and may cause:

• Widening of the part
• Reduced density over the crown
• Recession at the temples
• Thinner, shorter hairs
• Progressive change over several years

Androgenetic alopecia causes gradual miniaturization, with affected hairs becoming smaller in diameter and shorter over time.

Reviewing the Medical History

A dermatologist may ask about:

• When the hair loss began
• Whether it was sudden or gradual
• Areas affected
• Recent illness or surgery
• Fever or severe infection
• Pregnancy or childbirth
• Weight loss or restrictive dieting
• Emotional or physical stress
• Current medication and supplements
• Menstrual or hormonal changes
• Family history of hair loss
• Hair styling and chemical treatments
• Scalp itching, pain, or burning

The timing can provide important clues. Some forms of shedding appear several months after the triggering event rather than immediately.

Patients should bring a medication list and photographs showing how the hairline or part has changed over time.

Examining the Hair and Scalp

The dermatologist examines both the distribution of hair loss and the condition of the scalp.

The examination may look for:

• Hair density
• Variation in hair thickness
• Broken hairs
• Short regrowing hairs
• Smooth bald patches
• Redness or scaling
• Pustules or crusting
• Loss of follicular openings
• Scarring
• Nail changes
• Eyebrow or body-hair loss

A gentle hair-pull test may be used to assess active shedding. When excessive resting hairs are released during the test, this can support a diagnosis involving increased shedding.

Using Trichoscopy

Trichoscopy is a magnified examination of the scalp and hair follicles using a dermatoscope or digital imaging device.

It may help the dermatologist evaluate:

• Hair-shaft thickness
• Follicular openings
• Miniaturized hairs
• Broken hairs
• Inflammation
• Scaling
• Signs of alopecia areata
• Scarring vs non-scarring hair loss

Trichoscopy can help distinguish early pattern hair loss from telogen effluvium and may also guide the selection of a scalp-biopsy site when necessary.

Scarring vs Non-Scarring Hair Loss

One of the most important parts of evaluation is determining whether the follicles are preserved.

In non-scarring hair loss, the follicular openings remain visible, and regrowth may be possible depending on the cause.

In scarring alopecia, inflammation damages and permanently destroys the follicles. Possible warning signs include:

• Smooth or shiny areas without visible follicles
• Scalp pain or burning
• Persistent redness
• Scaling around individual hairs
• Pustules or crusting
• Rapidly expanding patches
• Permanent-looking loss of density

Scarring alopecia requires timely diagnosis because follicles destroyed by inflammation cannot regenerate normally.

When Blood Tests May Be Needed

Blood tests are not necessary for every patient. They may be selected when the history or examination suggests a medical or nutritional factor.

Possible tests may evaluate:

• Complete blood count
• Iron or ferritin levels
• Thyroid function
• Selected vitamin or nutritional deficiencies
• Hormonal factors
• Autoimmune conditions
• Other findings based on symptoms

Testing should be targeted rather than automatically ordering every available hair-loss panel. Diffuse shedding may sometimes prompt evaluation of blood count, iron stores, and thyroid function.

When a Scalp Biopsy Is Considered

A scalp biopsy may be recommended when:

• Scarring alopecia is suspected
• Inflammation is present
• The diagnosis remains uncertain
• Several conditions appear similar
• Treatment has not worked as expected
• Hair loss is progressing rapidly

A small sample of scalp tissue is examined under a microscope. The biopsy may show inflammation, follicular damage, miniaturization, or scarring that cannot be confirmed through surface examination alone.

Treatment Depends on the Diagnosis

Possible treatment approaches include:

• Topical hair-growth medication
• Oral medication when appropriate
• Anti-inflammatory scalp treatment
• Corticosteroid treatment for selected autoimmune hair loss
• Antifungal medication
• Treatment of scalp psoriasis or dermatitis
• Correction of an identified nutritional deficiency
• Changes to damaging hairstyles
• Observation while temporary shedding recovers
• Hair-transplant evaluation for selected stable conditions

Alopecia areata, pattern hair loss, telogen effluvium, and scarring alopecia require different treatments. Beginning a commercial treatment program before identifying the cause may delay appropriate medical care.

Hair Care During Evaluation

While the cause is being investigated, patients may be advised to:

• Avoid tight braids, extensions, or ponytails
• Reduce repeated pulling and friction
• Limit excessive heat styling
• Avoid aggressive scalp massage
• Use gentle shampoo
• Treat active dandruff or inflammation
• Avoid scratching or picking the scalp
• Maintain adequate nutrition
• Avoid starting several supplements without medical advice

Traction from tight hairstyles can contribute to hair loss and may eventually cause permanent follicular damage when it continues for a long period.

When to Seek Early Evaluation

Consider seeing a dermatologist when hair loss:

• Develops suddenly
• Creates round or irregular bald patches
• Progresses rapidly
• Causes scalp pain or burning
• Occurs with redness, crusting, or pustules
• Affects the eyebrows or eyelashes
• Is accompanied by nail changes
• Begins after a new medication
• Continues for several months
• Causes significant emotional distress

Smooth round patches may indicate alopecia areata, while inflamed areas with missing follicular openings may suggest scarring disease.

Planning an Evaluation During Your Stay

International patients seeking hair-loss evaluation in Seoul should bring:

• A list of medications and supplements
• Previous blood-test results
• Photographs of earlier hair density
• Information about recent illness or weight changes
• Previous scalp-biopsy reports
• Products currently used on the scalp
• Details of previous hair-loss treatments
• Family history
• Length of stay
• Follow-up options after leaving Korea

Hair growth changes slowly, so treatment effectiveness usually cannot be judged during a short visit. The appointment may focus on diagnosis, baseline photography, immediate treatment, and a follow-up plan that can continue at home.

Questions to Ask During Consultation

Consider asking:

• What type of hair loss do I have?
• Is it shedding, breakage, or follicle miniaturization?
• Is there any sign of scarring?
• Do I need trichoscopy, blood tests, or a biopsy?
• Could medication or illness be contributing?
• Is regrowth possible?
• How long will treatment take to assess?
• How can follow-up continue after I leave Korea?

Diagnosis Should Come Before Hair-Growth Treatment

Hair loss can result from genetics, temporary changes in the hair cycle, autoimmune disease, inflammation, infection, medication, nutrition, or repeated physical tension.

A dermatologist evaluates the pattern of loss, scalp condition, hair shafts, medical history, and possible systemic factors before recommending treatment.

Early evaluation is especially important when hair loss is sudden, inflamed, painful, or potentially scarring. A diagnosis-based plan provides a more realistic understanding of whether the goal is regrowth, stabilization, control of inflammation, or prevention of further permanent loss.