Scalp Ultrasound in Hair Loss Medicine: Why I Routinely Use Ultra High-Frequency Imaging in Alopecia Assessment

Most hair-loss consultations still rely mainly on:

• visual examination

• photographs

• trichoscopy

• patient history

These are all important.

But increasingly, I believe there may also be value in looking into the scalp itself.

That is why I routinely use ultra high-frequency ultrasound as part of selected alopecia assessments and procedural planning at Growth Factor Hair Clinic.

What is scalp ultrasound?

Ultrasound uses sound waves to create real-time images beneath the skin surface.

Many people are familiar with ultrasound scans during pregnancy or for joints.

Ultra high-frequency ultrasound works on the same principle, but at higher resolution, allowing much smaller structures closer to the skin surface to be visualised.

In hair-loss medicine, this may include:

• scalp thickness

• connective tissue layers

• follicle depth

• blood vessels

• scalp structure

• tissue beneath the follicles

  
  

Importantly, ultrasound is not a treatment for hair loss itself.

It is an imaging tool.

Why look into the scalp?

Hair follicles do not exist in isolation.

They sit within a complex scalp environment made up of:

• skin

• connective tissue

• fat

• blood vessels

• nerves

• fibrous tissue layers

• tissue attached to the skull

In fact, you may be surprised that “scalp” is:

• Skin

• Connective tissue

• Aponeurosis

• Loose connective tissue

• Periosteum (thin layer over bone)

  
  

For years, most discussions about androgenetic alopecia focused almost entirely on shrinking hair follicles.

But researchers are increasingly exploring whether wider scalp changes may also matter, including:

• tissue changes

• fibrosis (stiffening)

• vascular changes (blood vessels)

• inflammation

• scalp biomechanics

• scalp microbiome

Ultra high-frequency ultrasound may allow some of these differences to be visualised non-surgically in real time.

The scalp is not anatomically identical everywhere

One thing that becomes obvious during ultrasound assessment is that the scalp is not uniform.

Different scalp regions naturally vary in:

• thickness

• tissue density

• mobility

• vascularity

• follicle depth

For example, the scalp at the temples is different in nature from the scalp at the crown or occipital region.

This is normal anatomy.

But it may also have implications for how we understand hair loss and how certain treatments are planned.

Why I use ultrasound in alopecia assessment

I use ultra high-frequency scalp ultrasound because I believe it may provide additional anatomical information beyond visual examination alone.

Depending on the situation, ultrasound may help assess:

• scalp tissue thickness

• follicle depth

• vascular structures

• variation between scalp regions

• procedural planning for regenerative treatments

  
  

At Growth Factor Hair Clinic we use the Clarius L20 ultrasound. A small amount of ultrasound gel is applied to your scalp, then the ultrasound device held gently over it for a number of sites on your scalp. I do this quickly and save your images into your digital clinical record for later viewing and assessment. I have almost twenty years experience using ultrasound, which I rely on to interpret your images.

Ultrasound and PRP treatment planning

One area where I find scalp ultrasound particularly useful is for platelet-rich plasma (PRP) treatment planning.

In clinical practice, ideal injection depth of PRP varies

• between patients

• between scalp regions

• or between different hair-loss patterns

  
  

Ultrasound helps me visualise scalp anatomy and tissue depth during assessment and procedural planning.

This does not mean ultrasound-guided PRP scalp treatment has been proven superior to PRP treatment without ultrasound in clinical trials.

That evidence does not yet exist to my knowledge - maybe I will perform a study on this in the future.

But I believe hair-loss medicine may increasingly move toward more anatomy-guided and personalised approaches over time.

What does the research say?

Research into scalp ultrasound is still evolving.

Recent studies have shown measurable structural differences in the scalps of people with androgenetic alopecia compared with people without hair loss, including differences in:

• scalp thickness

• follicle structure

• tissue beneath the scalp

• blood-flow signals

  
  

Researchers are increasingly exploring how imaging technologies may help improve understanding of hair-loss biology.

However, this remains an emerging field.

Important limitations

Ultra high-frequency scalp ultrasound is still relatively new within hair-loss medicine.

There are important limitations:

• research is still developing

• imaging interpretation requires training and experience - this has a massive impact - ultrasound interpretation skills take many years and even decades to develop fully

• not all clinics use the same equipment

  
  

Ultrasound should be viewed as one tool within a broader clinical assessment — not a standalone answer.

The future of hair-loss medicine?

I believe imaging technologies such as ultra high-frequency ultrasound may become increasingly important in alopecia medicine over the next decade.

Not because ultrasound cures hair loss - it doesn’t.

But because it may help clinicians and researchers better understand:

• scalp biology

• tissue structure

• follicle environments

• anatomical variation

• regenerative treatment planning

  
  

Hair-loss medicine is gradually moving beyond simply looking at the hairs themselves.

Increasingly, researchers are starting to study the scalp beneath them too.

Written by Dr Gwen Adey BDS MFDS RCS

First published 06/05/26