Alopécie diffuse : causes, types de calvitie et camouflage

Key takeaways

Diffuse hair loss is a loss of density spread across the whole top of the scalp, with no clearly defined bald area.
It is different from localised baldness (receding temples, crown) and from patchy hair loss.
It has many possible causes (stress, deficiencies, hormones, medication…): only a dermatologist or doctor can diagnose it.
In the meantime, thickening powder is particularly well suited to concealing diffuse thinning.

Diffuse hair loss (also called diffuse alopecia) is a loss of density that affects the whole head of hair rather than one specific area. You still have hair everywhere, but there is less of it or it is finer: your scalp shows under the light, your parting gets wider and your ponytail feels thinner. The good news is that this type of thinning is very easy to conceal. Here is how to recognise it, what can cause it and how to get a fuller look every day.

What is diffuse hair loss?

With diffuse hair loss, shedding or thinning affects the whole scalp fairly evenly. There is no “hole” and no sharp line between a dense area and a bald one. So it can be hard to spot at first: mostly, you notice less volume and a scalp that shows through under direct light.

The most common signs:

a parting that gradually gets wider;
more hair than usual in your brush or in the shower for a while;
a ponytail or plait that is thinner than before;
scalp visible on top of the head, especially under spotlights or in bright sun.

It affects both women and men. In women, it often shows up as thinning hair along the parting, while the hairline stays in place.

Types of baldness: where does diffuse hair loss fit?

People tend to talk about “baldness” as if it were one thing, but there are several types of baldness and they look quite different. Recognising yours helps you choose the right concealer and describe the situation more clearly to your doctor.

Localised baldness: temples and crown

This is the best known pattern in men: the temples recede, then the crown (the vertex) thins out, with well defined areas. It is most often androgenetic, which means it is linked to genetics and hormones.

Patchy hair loss

Some forms of alopecia create round, clearly defined patches that can be completely bald, such as alopecia areata. Others appear where hair is constantly pulled (tight braids, buns): this is called traction alopecia.

Diffuse alopecia

Here there is no specific area: density drops everywhere at once. Very different causes can produce the same overall look. For a broader overview, read our article on the causes and stages of baldness.

Possible causes of diffuse hair loss

Diffuse thinning is a symptom, not a diagnosis. It can have many origins, sometimes several at once. Here are the main families of causes usually mentioned, for general information only:

Telogen effluvium: diffuse shedding that often appears a few months after a significant event (major stress, an illness with fever, surgery, pregnancy and childbirth, a severe diet).
Deficiencies: a lack of iron or other nutrients may be involved.
Hormonal or thyroid disorders: a thyroid imbalance or hormonal changes (after pregnancy, at menopause) can play a part.
Certain medications: some treatments list hair loss among their possible side effects.
Diffuse androgenetic hair loss: in some people, especially women, androgenetic alopecia does not cause receding temples but an overall thinning on top of the head.

Some of these types of shedding are temporary, others are long lasting. There is no way to know without an examination.

Why you should see a dermatologist or doctor

If you notice diffuse thinning, the right move is to see your GP or a dermatologist. They can go over the past few months with you, examine your scalp and order a blood test if needed. Finding the cause matters: a deficiency or a thyroid problem is not managed the same way as androgenetic hair loss.

Avoid self medicating. Hairvisual products do not replace medical advice: they are cosmetics that conceal the loss of density without acting on its cause. They simply help you feel better in the meantime.

How to conceal diffuse hair loss

Diffuse thinning is very well suited to hair makeup: there is still hair across the whole area, so products have something to cling to.

Thickening powder: the best fit

Ecobell densifying powder is made of cotton cellulose microfibres that cling to your existing hair thanks to their electrostatic charge. Each hair looks thicker and the fibres lightly tint the scalp, so the see-through effect fades. The formula contains 99.6% ingredients of natural origin, it is vegan and it comes in 9 shades that you can mix together. It washes out with shampoo.

To apply it, start with clean, dry, styled hair. Sprinkle the powder over the thinning areas, pat lightly, then gently restyle. Build it up in small amounts rather than all at once.

Volumiz spray for more coverage

If your scalp shows through over a large area, Volumiz densifying and colouring spray can complement the powder. This 2-in-1 spray visually thickens thinning areas and also covers grey roots. It lets you treat the whole top of your head quickly.

Hairvisual tip: with diffuse hair loss, less is more. A thin layer of Ecobell powder spread over the whole top of your head looks more natural than a large amount concentrated in one spot. Then add a few sprays of Ecobell fixing spray to lock the fibres in place.

Hairstyle and parting: good habits

Switch your parting regularly or try a zigzag parting, which shows less scalp than a straight one.
Dry your roots upside down or with a round brush to gain volume.
Go for a layered or slightly shorter cut: heavy lengths flatten your hair and make thinning more obvious.

Mistakes to avoid

Too much product in one spot: it starts to show. Several thin layers work better than one thick one.
A shade that is too light: your scalp stays visible. Match the colour of your roots and mix two shades if needed.
Tight hairstyles: tight ponytails and buns put extra strain on hair that is already fine.
Applying to wet hair: the fibres clump together. Always work on fully dry hair.
Putting off the appointment: concealing should never stop you from looking for the cause.

Frequently asked questions about diffuse hair loss

Is diffuse hair loss permanent?

It depends entirely on the cause. Shedding after stress, an illness or a pregnancy is often temporary, whereas androgenetic hair loss tends to progress over time. Only a dermatologist or doctor can tell the difference after an examination. In the meantime, concealing products help you keep a fuller look, whatever happens next.

How can I tell diffuse hair loss from classic baldness?

Look at where the loss is. Classic baldness affects specific areas: receding temples, the crown, or clearly defined patches. Diffuse hair loss thins out the whole top of the head with no clear boundary, and it is most noticeable at the parting and under direct light. The two can sometimes occur together, so a medical opinion is the way to be sure.

Is thickening powder suitable for women?

Yes. Diffuse thinning along the parting is actually one of the situations where powder gives the most natural result, because the fibres cling to the hair that is still there. It works on long or short hair, straight or curly. Just remember to spread the product evenly and to choose a shade close to your roots.

Diffuse hair loss can be unsettling because it does not show in one specific place, but it is easy to conceal. Start by talking to a health professional to find out the cause. To get a fuller look right away, explore our range of densifying powders and choose the shade that matches your roots.