Dandruff occurs when the scalp flakes more rapidly than normal. This can happen for various reasons, such as excess oil, dry skin, the presence of microorganisms like Malassezia , or scalp irritation. Factors like sweat, the use of harsh products, or inadequate hygiene can also disrupt the scalp's balance and contribute to excessive flaking.
What is dandruff really?
Dandruff is an excessive flaking of the scalp .
The skin of the scalp is constantly renewing itself, but when this process accelerates, dead cells accumulate and the typical white flakes appear.
In many cases, dandruff is also accompanied by:
- scalp itching
- irritation or redness
- feeling of tightness or dryness
Although it is usually a mild problem, when not treated properly it can become severe or persistent dandruff .
Main causes of dandruff in hair
Dandruff doesn't appear for just one reason. It's usually the result of several factors that disrupt the scalp's natural balance.
These are some of the most common causes.
Excess oil on the scalp
One of the most frequent causes is excess sebum .
The scalp naturally produces oil to protect the skin and hair, but when this production is excessive it can promote the appearance of a microorganism called Malassezia .
This microorganism is naturally present on the skin, but when it spreads excessively it can cause irritation and accelerate skin peeling.
In these cases, what is known as oily dandruff usually appears.
Dry scalp
In other cases, the exact opposite occurs.
An excessively dry scalp can cause fine flaking, often accompanied by itching or a feeling of tightness.
This type of dandruff usually appears when:
- shampoos that are too harsh are being used
- She washes her hair with very hot water.
- The scalp loses moisture due to sweat or other causes.
In these cases we are talking about dry dandruff .
Improper hair washing
The way you wash your hair also makes a difference.
Both washing your hair too frequently using harsh products, and not washing your hair if you sweat or if residue accumulates on the scalp, can disrupt the scalp's natural balance.
When sweat, oil, or hair product residue accumulates, the scalp can become irritated and promote the appearance of dandruff.
Seborrheic dermatitis
In some cases, dandruff is related to a condition called seborrheic dermatitis .
It is an inflammation of the scalp that causes:
- more visible peeling
- redness
- itching
This type of dandruff is usually more serious and persistent.
Sweat and physical activity
Sweat can also influence the balance of the scalp.
When sweat accumulates on the scalp for many hours, and dries on the skin, it creates an environment that promotes irritation and flaking caused by the salts in that sweat.
This is especially common in people who practice sports regularly.
Types of dandruff
Although dandruff is often discussed as a single problem, there are actually different types of dandruff , and each one can have different causes.
Dry dandruff
It is characterized by small, thin scales that detach easily from the scalp.
It usually appears when the skin is dehydrated or when overly aggressive products are used.
Oily dandruff
In this case, the scales are usually larger and are associated with an excess of oil on the scalp.
It is common for it to be accompanied by itching or a feeling of an irritated scalp.
Seborrheic dandruff
It is related to seborrheic dermatitis and usually causes more visible and persistent scaling.
In these cases, the scalp may also present reddened or inflamed areas.
What to do when dandruff won't go away
One of the most frustrating situations is when dandruff does not disappear despite washing your hair frequently .
This usually happens when the cause of the problem is not correctly identified.
Some recommendations that may help are:
- use a shampoo suitable for the scalp
- Avoid overly aggressive products
- maintain regular hair hygiene
- avoid the accumulation of sweat for many hours
If dandruff is very persistent or severe, it may also be advisable to consult a dermatologist.
How to prevent dandruff
Preventing dandruff often depends on maintaining the natural balance of the scalp .
Some practices that can help are:
- Use gentle shampoos that respect the scalp's natural barrier.
- Avoid excessively hot water.
- maintain a washing routine suited to your lifestyle
- eliminate sweat and residue after playing sports
When the scalp is kept clean, moisturized and balanced, the chances of the characteristic flaking of dandruff appearing are greatly reduced.
Frequently asked questions about dandruff
Why does dandruff appear?
Dandruff occurs when the scalp flakes more quickly than normal. This can be due to excess oil, dry skin, the presence of microorganisms such as Malassezia , or scalp irritation.
Does dandruff appear because of a dry scalp?
Not always. Although dryness can cause dandruff, it is often related to excess oil on the scalp or imbalances in the skin's microbiota.
Can sweat cause dandruff?
Sweat alone does not cause dandruff, but when it accumulates on the scalp for many hours it can promote irritation and disrupt the skin's natural balance.
Why do I have dandruff even though I wash my hair every day?
Washing your hair frequently doesn't always eliminate dandruff. If the shampoo is too harsh or not formulated for frequent washing, it will most likely worsen the problem.
What to do when dandruff doesn't go away?
When dandruff persists for a long time, it's best to identify its cause. In some cases, it may be necessary to use a shampoo specifically formulated for the scalp or consult a dermatologist.
Can dandruff appear suddenly?
Yes. Changes in stress, weather, washing routine, or scalp conditions can cause dandruff to appear suddenly.
