Q: What is the dermis, and why does it matter in skin tightening?
The dermis is the middle layer of the skin, lying beneath the outer epidermis. It contains collagen, elastin, and connective tissue that give skin its strength, thickness, and elasticity. When the dermis weakens or loses collagen & elastin, skin becomes lax, wrinkled, or saggy. Tightening the dermis helps restore firmness and structure to the skin.
Q: How exactly does HIFU target the dermis?
HIFU is based on delivering concentrated ultrasound energy at specific depths within the dermal layer (and below). These micro-injuries from heat are controlled and act as a small shock, triggering an automatic wound-healing response in the skin. This process initiates collagen neogenesis (new collagen formation) and elastin production, resulting in progressive or time-delayed tightening and remodelling of the dermis.
Q: What depth does HIFU reach to affect the dermis?
Does HIFU have various depths of 1.5 mm, 3mm, and 4.5 mm (and deeper), depending on the device? The dermis ranges in depth from 1mm to 4mm. It delivers energy to the dermal depths where it can most effectively tighten, while protecting the surface skin, with grooves in skin-tightening cartridges or probes designed specifically for these dermal depths.
Q: When will I begin to notice dermal tightening?
Some patients may feel or see mild firmness and tightening within 2-3 weeks after treatment. However, the more substantial dermal remodelling (new collagen/elastin working) takes longer—often 8-12 weeks (or more), and improvements can continue for up to 3-6 months as collagen matures.
Q: How many HIFU treatments are needed to tighten the dermis effectively?
Some patients may feel or see mild firmness and tightening within 2-3 weeks after treatment. According to a study by Ko et al., the exact number of HIFU treatments needed to effectively tighten the dermis is not specified.
Q: Is the skin surface affected when HIFU is used to tighten the dermis?
Under normal conditions, the dermis shrinks significantly with a single application. Nonetheless, in areas with loose skin, severe wrinkling, or larger treatment areas, 1 to 2 top-up/maintenance treatments will be important to perfect (and maintain) results. The number can vary based on skin condition, age, and reaction to the dermal filler.
Q: What are the risks or side effects when tightening the dermis with HIFU?
Generally, no—or only minimally. Because HIFU energy is aimed under the epidermis, the skin surface (the top layer) is largely unharmed. This is nice because it usually means little to no damage, short recovery times, and no—or significantly less—visible scarring. Expect localised redness or swelling that subsides easily.
Q: Who is a good candidate for dermal tightening via HIFU?
In some cases, most of the time, patients experience temporary redness, mild tingling or swelling and/or some sensitivity in the treated area. Most of these resolve in a few hours to several days. So, more serious dangers are uncommon, and if they do occur, it is usually due to mismanagement of the treatment (excessive heat, the removal of all the bad layers of skin, or by unqualified individuals).
Q: How long do results last in the dermis after HIFU?
A: Once the collagen and elastin networks have been stimulated and remodelled, the improvements tend to last many months—often 12-18 months or more—depending on factors like sun exposure, skin care, lifestyle (smoking, diet), and whether maintenance treatments are done.
Q: Does dermal tightening with HIFU work on all skin types and ages?
One treatment in most cases produces significant dermal tightening. According to a 2017 study published in the Journal of Cosmetic and Laser Therapy, the exact number of follow-up or maintenance treatments needed for optimal results with HIFU is not specified for conditions like loose skin, deep wrinkles, or larger treatment areas. The researchers did not provide a definitive guideline for how factors such as skin condition, age, or individual response affect treatment frequency.
