Vascular occlusion in the forehead: signs and initial management

The forehead looks like a simple area to treat: a wide, flat surface with bone right underneath. In practice, it brings together some of the arteries that worry us most in HOF. The supratrochlear artery and the supraorbital artery are branches of the ophthalmic artery and run up the frontal area, which puts them in direct communication with the circulation of the eye. That is why occlusion in the forehead calls for the same respect as in the glabella, with which it shares much of the risk.

This page is a review for professionals and includes no injection technique, doses or dilutions. The base concept is in vascular occlusion. For treating the forehead itself, see hyaluronic acid in the forehead and biostimulator in the forehead.

Which arteries deserve attention?

The forehead is supplied by branches coming from the orbit and from the temporal circulation, and the relationships vary between people.

• Supratrochlear: emerges near the medial corner of the orbit and climbs almost vertically, near the midline, toward the scalp.
• Supraorbital: exits through the notch or foramen of the upper orbital rim and divides into superficial and deep branches, which climb the forehead.
• Branches of the superficial temporal artery: supply the lateral part of the forehead and communicate with the frontal arteries, forming a wide network.

These arteries connect with each other and with the glabellar and nasal network through anastomoses. The variability in course and depth, described in anatomical studies, is the reason the idea of a fixed "safe zone" is discouraged. The general risk map is in vascular danger zones of the face, and complementary anatomy is in periorbital anatomy for injectables.

What is the blanching pattern in the forehead?

What usually marks a frontal occlusion is the linear distribution. Because ischemia follows the course of an artery, the affected area tends to form a band of variable width, generally starting at the glabella or the medial third of the brow and climbing toward the hairline.

What can be mistaken for occlusion?

The forehead also turns red, pale or swollen for benign reasons, and it helps to have criteria.

• Pallor from anesthesia or vasospasm: after blocks or anesthetics with a vasoconstrictor, the skin can lighten for a while. The difference is covered in vascular occlusion or anesthesia pallor. Regional blocks are in supraorbital and supratrochlear block.
• Pressure from the injection itself or from a finger: brief blanching that returns when pressure is released is not ischemia.
• Swelling: diffuse puffiness, without pallor and with normal capillary refill.
• Bruise: purple patch that changes color over the days.
• Tyndall effect: superficial bluish tone, common with a thin layer of product. See Tyndall effect in the forehead and temples.

The central point is the course. Pallor that does not return, pain that increases and a net-like color over minutes tip the balance toward ischemia.

Initial management: organizing the response

At review level, complication protocols describe a sequence the team should know by heart:

1. Stop the injection on the spot and do not try to "correct" it by adding more product.
2. Examine the area and compare with the opposite side: color, temperature, capillary refill, extent.
3. Ask about vision and check eye signs at a basic level.
4. If there is a visual symptom, refer immediately to ophthalmology, without waiting for the skin to evolve.
5. With hyaluronic acid, use hyaluronidase according to current guidelines and the professional's judgment, reassessing perfusion.
6. Adjuvant measures and systemic medication vary between protocols, and prescribing is up to the physician.
7. Document everything: times, findings, photos, actions.
8. Keep the patient under observation until there are signs of reperfusion and set a short follow-up.

For the clinic's material setup, see hyaluronidase in the clinic and the emergency kit.

What about the scalp?

The particularity of the forehead is that ischemia can extend upward. In occlusions that affect the upper frontal branches, reports describe lesions at the scalp margin, with scabs and hair loss in that spot, which can be permanent if the necrosis is deep. This makes follow-up longer and the conversation with the patient more candid. In extensive cases, evaluation by a dermatologist or a surgeon experienced in wounds helps plan healing and rehabilitation.

How can the risk be reduced in the forehead?

• Know the anatomy and accept the variation. Dissection studies show different courses between individuals, which discourages rigid recipes.
• Conservative volume per session, preferring to go in stages.
• Choose product and instrument carefully. The discussion is in cannula or needle and the differences between densities in low and high density hyaluronic acid.
• Avoid treating the forehead and glabella in the same session with large volumes, at the professional's discretion, because of the combined risk. The order in combined sessions is in order of procedures in the same session.
• Consider alternatives when the concern is not about volume. Dynamic lines call for a different approach, as in botulinum toxin in the frontalis muscle.
• Have the enzyme, the protocol and the team ready before starting.

How to talk to the patient

Record in the consent form that vascular occlusion, necrosis and visual complications were explained. See informed consent.

In Harmy

Closing

The forehead pairs a seemingly innocent surface with arteries that connect to the eye. The band-like pattern, the scalp risk and the possibility of visual compromise make up the list of what to remember. Preparation is worth more than haste: a written protocol, available enzyme, a trained team and an honest conversation with the patient before any injection. See also the sister page glabellar vascular occlusion.