Hairline and upper third proportion in HOF

When people talk about the upper third, the focus usually goes to the frontal lines, the glabella and the eyebrow. The hairline is left out of the conversation, as if it were a frame. But it is part of the upper third, and it changes how everything else reads: a high forehead stands out more, a receding line alters facial proportion and a recent hair transplant changes the skin of the area.

The text is a review and planning piece. It does not indicate product, dose or technique, which are the decision of the qualified professional, after assessment and according to the rules of their professional council in Brazil. For the supporting entry, see upper third.

Where does the upper third begin?

The upper third is, by convention, the area between the hairline (the trichion) and the glabella. The reference most used in facial analysis is the trichion, the point where the forehead skin meets the scalp at the midline. The lower third ends at the chin, and the middle third lies between the glabella and the base of the nose. The idea of three roughly equal thirds is a reference model, not a rigid rule (see facial assessment by thirds and Powell and Humphreys proportions).

The difficulty with using the trichion as a reference is that the hairline changes: it recedes with balding, advances with a transplant, and looks different in people who wear bangs or a specific hairstyle. This means the measurement of the upper third can vary without the anatomy of the forehead having changed.

Which variations matter in HOF?

Observation should be done with the hair pulled back, from the front and in three-quarter view, comparing with an old photo when there is one. The standardized photo is indispensable (see standard views of the face and standardized clinical photography).

How does the hairline change forehead planning?

The frontal region depends on a balance between the muscles that raise and lower the eyebrow, which is the center of assessing toxin in the forehead. The frontalis muscle raises the eyebrow, and a high forehead has a larger muscle area. In a low forehead, the muscle is shorter, and the risk of weight on the eyebrow rises.

Some usual lines of reasoning, which are not rules:

• High forehead: usually calls for attention to the extent of the muscle area and to the possibility of ptosis if there is excessive weakening.
• Low forehead: calls for care with the position of the eyebrow and eyelid, because the room for margin is smaller.
• Receding temples: can change the distribution of the lateral forehead lines.
• Low eyebrow: in any proportion, calls for careful assessment (see botulinum toxin in the eyebrow and eyebrow position).

The overview of complications in the forehead and eyebrow is in ptosis after botulinum toxin and aging of the forehead and eyebrow.

What about hair transplants and other hair treatments?

Patients who have had or plan to have a hair transplant, eyebrow transplant or other hair and scalp procedures often show up in the HOF office. A few precautions:

1. Ask and record the history: type of procedure, date, area and scars.
2. Respect healing. Recently operated skin has its own sensitivity and risk. Wait the time recommended by the responsible physician.
3. Do not attribute to the hair procedure what may belong to HOF, and vice versa, when complications arise.
4. Coordinate with the other professional, when forehead and hairline are planned together.
5. Avoid promising that HOF "compensates" for the hairline.

Concerns about hair loss, a receding line and balding belong to dermatology and the hair field. The HOF professional's role is to recognize the concern, listen and refer. See patient referral in HOF.

How does the hairline affect how the face reads?

Two effects appear often.

Proportion and balance

A high forehead can make the face look longer, and the patient often calls it a "big forehead." In some cases, harmonizing the middle and lower thirds changes the perceived balance, but that is a reading of the whole, not a correction of the forehead. The rule of fifths and the classic proportions serve as a reference for conversation, not as a goal.

Eyebrow and gaze

A high forehead with a low eyebrow gives the impression of a heavy gaze. The same forehead with a well-positioned eyebrow can look harmonious. Eyebrow position is usually more decisive for the concern than the height of the forehead itself.

What to tell the patient?

The conversation needs to separate what HOF does from what it does not, without devaluing the concern.

Record the conversation in the patient record and update the informed consent with the limits explained.

Does Harmy help in the conversation about the upper third?

Harmy simulates volume in the marked areas. In the upper region, the relevant point is the Glabella and, indirectly, the temples. The app does not alter the hairline, the height of the forehead or the position of the eyebrows, because the prompt forbids changing hair and expression.

For the app flow, see how to use Harmy.

Review quiz

The hairline is the frame that changes how the picture reads. Recognizing its influence avoids treating the forehead as the problem when the bother is proportion, eyebrow or hair, and helps you talk to the patient with more precision and less promise.