What to Check When Your Forehead Structure Looks Flat

Hello.

I’m Kim Ha-won from Beauty’s Doctor.

You may not notice it much when looking straight ahead in the mirror,

but after seeing a candid side-profile photo,

you may have thought,

“Is my forehead flatter than I expected?”

Conversely,

👉 The sides may look sunken, creating an M-shaped appearance

👉 The forehead may look narrow

👉 Only the very center may look noticeably protruded

These are situations in which you may start considering forehead filler,

but there is one important point to keep in mind.

Even with the same “forehead filler,”

👉 The approach differs completely depending on the shape of the forehead

👉 And on which areas appear to lack volume

To get straight to the point,

forehead filler is not simply a procedure for adding volume;

it is closer to a procedure for designing the overall contour.

📌 The design differs even with the same forehead filler

The most important aspect of the forehead

is not simply how “rounded” it is.

The key is how naturally the curve continues

when viewed from the side.

That is why, even when the same amount is injected,

the result can vary completely depending on

👉 Where it is injected

👉 How deeply it is placed

👉 Which product is used

During consultations, three things are commonly assessed.

✔️ Whether the side-profile curve lacks fullness

✔️ Whether the areas on both sides of the hairline are sunken

✔️ Whether the left and right sides are balanced

These factors are considered together

to determine the design direction.

That is why during a consultation,

rather than asking,

“How many cc should be injected?”

👉 It is important to first explain

“What kind of contour will be created?”

🔍 A flat forehead — the most common type

The most common case is a forehead

that looks flat, almost like a straight line, when viewed from the side.

In this case, the priority is to create

a natural curve starting from the center.

Typically,

✔️ Hyaluronic acid filler is used to establish central volume

✔️ A collagen booster is used to create a smooth transition around the outer areas

This approach is often used.

✔️ Hyaluronic acid filler

Fillers containing hyaluronic acid

are made with a substance that attracts moisture

and are primarily used at medical institutions

to supplement volume in localized areas.

✔️ Collagen booster

Collagen boosters consist of ingredients

that induce the production of the body’s own collagen

and are used to help refine the overall contour

while minimizing irritation to localized areas.

⚠️ Adding too much at once can make a flat forehead look unnatural

One of the most common regrets with a flat forehead

is repeatedly saying,

“Please add just a little more,”

only to end up with a forehead

that looks protruded rather than smoothly rounded.

Especially when too much is added from the beginning,

✔️ It may look like a lump from the side

✔️ The forehead alone may look swollen from the front

✔️ The center of the face may appear visually heavy

These effects may occur.

Therefore, rather than trying to complete a flat forehead in one session,

it is recommended to determine an appropriate amount

through consultation with a medical professional

and gradually refine the contour in stages.

👀 An M-shaped forehead requires a completely different approach

Some people have a forehead whose center looks fine,

but the areas on both sides of the hairline are sunken.

In this case,

the forehead may look narrow from the front,

and when the hair is pulled back,

the shadows on both sides may become more noticeable.

This is commonly described

as an “M-shaped forehead.”

The important point here is that,

rather than adding more volume to the center,

the lines on both sides need to be reinforced separately.

Continuing to raise only the center

may actually emphasize the M-shaped appearance.

⚠️ Safety is even more important for an M-shaped forehead

The areas on both sides of the hairline

are regions where relatively superficial vascular branches pass.

Therefore, details such as

👉 How deeply the product is injected

👉 Whether a needle is used

👉 Whether a cannula is used

become important, rather than simply injecting a large amount.

📖 What is a cannula?

It is a tube-shaped injection instrument with a rounded tip.

It is known to help reduce the risk of vascular injury

compared with a conventional needle.

Therefore, during a consultation for an M-shaped forehead,

it is helpful to discuss not only the contour design,

but also how the procedure will be approached safely.

📍 For a narrow forehead, the temples may also be important

Among people whose forehead looks narrow,

the issue is often not the forehead itself,

but rather sunken temples,

which can make the face look more closed-in.

In this case,

rather than enlarging only the forehead,

supplementing the temples as well

may make the facial proportions look more natural.

Conversely,

for someone whose central forehead is already prominent,

it may be more suitable to refine only the balance on both sides

rather than adding more volume.

That is why forehead filler

is closer to a procedure that considers the balance of the entire face

than one that simply means “adding more.”

💡 Some hairline concerns cannot be solved with filler

Sometimes, the reason the forehead looks narrow

is the hairline itself.

In this case,

rather than enlarging the forehead with filler,

👉 Hairline correction

👉 Changes in styling

may be more effective approaches.

In other words,

forehead filler is not a procedure that changes everything;

it is closer to a procedure for finding

the most natural curve within your current facial structure.

📸 Designing from an actual mirror view is more important than photos

Many people look only at photos and ask,

“Do I have that forehead shape?”

Of course, side-profile photos can be helpful.

However, for accurate design,

it is important to consider all of the following together:

✔️ The front view

✔️ The 45-degree view

✔️ The side profile

✔️ Changes in facial expression

✔️ The position of the hairline

Photos can serve as a reference,

but the process of shaping the contour

in front of an actual mirror is much more important.

❓ Frequently asked questions

Q. Can an M-shaped forehead be completely filled with filler?

A. It depends on the degree of indentation.

If the indentation is deep,

it is often more natural and safer

to create the contour over two or three sessions

rather than filling it excessively all at once.

Q. Why is it sometimes recommended to treat the temples as well?

A. If the temples are sunken,

filling only the forehead

may actually make the face look more closed-in.

Therefore, the temples are often designed together

to achieve overall balance.

Q. Does a flat forehead look better the more volume is added?

A. Excessive volume can actually make it look unnatural.

Especially for a flat forehead,

creating the curve gradually

rather than adding a large volume all at once

often leads to a more natural result.

[Post-Procedure Precautions and Information on Side Effects]

After forehead filler and collagen booster procedures,

temporary swelling, bruising, or pain

may occur depending on the individual’s constitution.

In rare cases, side effects such as

skin necrosis or reduced vision due to vascular compression or occlusion,

delayed-onset nodules, or infection

may also occur.

If you notice any unusual signs after the procedure,

you must contact a medical institution immediately.

Thank you for reading this lengthy post.

This was Wi Young-jin.