The Layer journal
Thoughtful care starts with better questions.
From Dr. Sijin Park’s practice: choosing treatments, understanding your skin, and talking honestly about results.

Submandibular Gland Botox: Anatomy, Injection Location, and Depth
Muscles involved in swallowing and voice production, along with blood vessels, lie close to the submandibular glands. I’ll explain how anatomy and a 2024 ultrasound study help guide injection location and depth.
Read the article
Submandibular Gland Botox: Why a Double Chin Can Remain After Ultherapy or ONDA
Fat is not the only cause of fullness under the chin. Learn how to distinguish prominent submandibular glands from fat, what Botox injections into these glands can do, who it suits, and its possible side effects.
Read the article
Forehead Botox: Mephisto Sign (Spock Brows)
The Mephisto sign (Spock brows) and heavy-feeling eyes after forehead Botox can have different causes. Here is how frontalis anatomy and the C-line guide prevention and follow-up.
Read the article
Can masseter Botox make the jawline sag?
If the masseter shrinks faster than the skin can adapt, jowling can become more noticeable. I review three published reports, the factors to assess before treatment and four options we discuss in consultation.
Read the article
Re2O updates: adverse effects, injection methods and energy device combinations
What I took from a Re2O conference: vascular complications, nodules and immune reactions, plus injection planes and RF/HIFU combinations. Published findings and early discussions need to be read differently.
Read the article
After mole or flat wart removal: caring for your skin
From a dressing that comes off to ointments, moisturizers and sun protection: answers to common questions about caring for your skin after mole or flat wart removal.
Read the article
XERF and Thermage: choosing with your skin in mind
A closer look at radiofrequency lifting: what each device is designed to do, the trade-offs discussed in consultation, and why expectations matter.
Read the article
Ultherapy, again? A conversation about balance
I sometimes see a particular pattern after repeated HIFU treatments. Here is why your treatment history matters as much as your next appointment.
Read the article
When treatment results are hard to see
The difference between a visible change and a change you can feel. An honest conversation about expectations, subtle results and assessing progress.
Read the article