What is Scarlet S?
Scarlet S is a device name for a system that delivers radiofrequency energy to chosen skin layers through microneedles.
In microneedling radiofrequency devices the needles enter the skin and energy is released from the needle tip. The upper layer is largely spared while controlled heat forms in the dermis and triggers tissue renewal. Supplier sources state that needle depth can be set at roughly 0.5 to 3.5 mm; this should be confirmed from the manufacturer's documentation.
For the general class, see the microneedling and radiofrequency pages. Detailed specifications may vary by model and version.
How does it relate to Scarlet X?
Both are device names mentioned in the microneedling radiofrequency class; their technical differences should be confirmed from manufacturer documents and from the clinic's model.
Similar names do not mean identical features. Needle type, the way energy is delivered and depth settings may differ. It would therefore not be accurate to say one is better than the other.
See the Scarlet X page for more on that device. Which device suits you depends less on the name than on the type of problem, skin thickness and expectation.
Which concerns is it considered for?
It may be assessed for acne scars, enlarged-pore appearance, fine lines, texture irregularity and mild laxity.
The effect of this class is usually slow and gradual, and weeks may be needed to see results. It is not expected to be enough alone for deep sagging or marked volume loss; other methods are discussed in those cases.
The scar type, skin thickness and skin tone shape the plan. On darker skin, energy settings and spacing are particularly important, so assessment by an experienced physician is needed.
What are the session and recovery like?
It is done after topical numbing cream; a few days of redness, mild swelling and needle marks may follow.
A session takes roughly 30 to 60 minutes depending on the area. Stinging and heat can be felt. In the first days the skin may be red and rough, and fine crusting may appear. Time to return to social life varies with the person and the settings.
The physician sets the number of sessions and the spacing. Sun protection and following the recommended care steps are important.
What are the risks and who may not be suitable?
Redness, swelling, bruising, pigment darkening, cold sore flare-ups and, rarely, infection or scarring can occur.
Pregnancy and breastfeeding, active infection, pacemakers and some implants, isotretinoin use, a tendency to keloid and bleeding disorders can change the plan. Metal implants or fillers in the area are also considered.
If there is unexpected pain, pus-like discharge, fever or widespread bruising, do not treat it yourself and contact the clinic.
Frequently asked questions
Is Scarlet S the same as microneedling?
No. Classic microneedling works mechanically only; devices of the Scarlet S class also deliver radiofrequency energy through the needles.
How many Scarlet S sessions are done?
It depends on the problem. A short course is usually planned and results are not guaranteed.
Does it hurt?
Stinging and heat can be felt. A topical numbing cream can increase comfort.
Does it help acne scars?
It may improve the appearance of some scar types; results vary by scar type and expectations should stay realistic.
Can it be done in summer?
Because of sun exposure risk, cooler months are usually preferred; the final decision rests with the physician.
Sources (4)
- U.S. FDA (510(k) Premarket Notification database): 510(k) K180872: Scarlet SRF (2018)
- Journal of Cosmetic Dermatology: Radiofrequency Microneedling for Facial Rejuvenation: A Systematic Review (2026)
- U.S. FDA: Potential Risks with Certain Uses of Radiofrequency (RF) Microneedling – FDA Safety Communication (2025)
- American Academy of Dermatology: Statement on the FDA Safety Briefing about Radiofrequency Microneedling Risks (2025)
This content is for general information and does not replace a personal medical assessment.