Why Current BLT Numbing Creams Are a Pain — And How Triple Triple Nanoemulsion Technology Changes Everything

Ellie Rahmani

Introduction: The Reality of Topical Anesthesia 

Topical numbing creams play a critical role in aesthetic and dermatologic procedures, where patient comfort and procedural efficiency are closely linked. BLT and LT formulations—combining benzocaine, lidocaine, and tetracaine—are widely used to reduce discomfort during treatments such as radiofrequency microneedling, thread lift, laser procedures, and injectables. In theory, when a customer walks into your clinic, they expect an in-and-out procedure. These products should support smooth, predictable workflows and allow clinicians to focus on precision rather than pain management. 

In practice, however, many current BLT creams introduce avoidable challenges. Long onset times, inconsistent duration of anesthesia, and the need for reapplication can disrupt clinic schedules and interrupt procedures. Textural issues and skin irritation further complicate use, particularly in patients with sensitive or recently treated skin. These gaps between expectation and performance have become more apparent as clinics move toward faster, higher-throughput, and more patient-centered care models—raising the question of whether traditional numbing cream delivery systems are still fit for modern and clean clinical demands. 

Why Current BLT Creams Fall Short 

Current BLT formulations may not fully align with the evolving needs of technicians, clinicians, and patients in aesthetic and dermatologic practice settings. In many workflows, topical anesthetic creams are applied during a pre-procedure waiting period, and variability in perceived onset and duration may influence scheduling efficiency and procedural planning. In longer sessions, differences in duration of effect may require additional handling or reapplication, which can affect workflow continuity.

Certain formulation characteristics—such as thick, heavy, greasy, or highly occlusive textures—may influence spreadability, uniformity of application, and overall cosmetic feel. Examples include Pluronic Lecithin (PLO) gels and anhydrous ointment bases containing ingredients such as silicones, polyethylene glycols (PEGs), petrolatum, shea butter, or lecithin. 

Depending on formulation design, residue profile and drying characteristics may vary, which can influence ease of removal and procedural handling. Some BLT formulations use solvent-based systems intended to support dispersion of active ingredients. Common solvents may include alcohols, propylene glycol and DMSO. These systems may vary in skin feel and tolerability depending on composition, concentration, and individual skin sensitivity, particularly in sensitive or recently treated skin contexts. 

Why Delivery Matters More Than Concentration 

There is a common perception that higher active pharmaceutical ingredient (API) concentration may correlate with increased topical performance; however, skin functions as a structured barrier rather than a simple absorptive medium. The performance of topical formulations is influenced not only by API concentration but also by formulation design and delivery system characteristics, including conventional emulsions and solvent-based systems. As a result, there is increasing interest in controlled and targeted delivery approaches that aim to support more consistent and predictable formulation behavior. 

Clinically Clean Formulation Design Approach 

This approach focuses on reducing reliance on high-load solvent systems and instead emphasizes lipid-based and water-compatible formulations. The goal is improved cosmetic elegance, easier application, and simple water-based removal. 
Key considerations include: 
● Eliminate solvent load 
● Improved cosmetic tolerability 
● Lightweight, non-greasy aesthetics 
● Barrier-compatible application characteristics 
● Easy water-based removal 

The Solution: Triple Nanoemulsion Technology 

CNANO’s triple nanoemulsion technology is a lipid-based delivery system designed to support structured distribution of active ingredients within topical formulations.

The system is designed to support:  

  • More uniform distribution across the application area
  • Lightweight, non-greasy cosmetic texture
  • Improved onset and duration of anesthesia
    • Improved formulation stability
    • Consistent spreadability and ease of application
    • Simplified removal after use
  • Solvent independent permeability
  • Clean , hypoallergenic 

The nanoemulsion system is designed to support formulation performance without relying on heavy occlusive bases or high-solvent systems.  

Why No Solvent = Better for Skin 

Skin-Compatible Delivery 

This formulation approach is designed to align with the skin’s natural structure, with particular attention to the outermost layer (stratum corneum) in topical application contexts. Reducing reliance on certain solvent-based systems may support a formulation profile that is more compatible with the skin’s barrier properties. 

The nanoemulsion-based system is designed to work within lipid-compatible pathways at the formulation level, supporting controlled application and cosmetic performance across different skin types and treatment contexts. 

  • Designed to align with the skin’s natural lipid structure
  • Supports barrier-compatible formulation characteristics 

Reduced Irritation & Improved Tolerability 

Some solvent-based topical formulations may be associated with variable skin sensations such as warmth, stinging, tightness, or redness, depending on formulation composition and individual skin sensitivity. These experiences may be more noticeable in sensitive or recently treated skin. 

CNANO focuses on formulation design considerations intended to support improved cosmetic tolerability and user comfort across a range of skin types and clinical contexts. The approach prioritizes gentle application characteristics and compatibility with sensitive or compromised skin conditions. 

  • Suitable for sensitive or recently treated skin
  • Designed for improved cosmetic tolerability and reduced visible skin reactivity 

Controlled Absorption, Not Forced Penetration 

LNP3 technology is designed to support controlled and gradual distribution of active ingredients across the application area. The system is intended to promote more consistent topical coverage and reduce variability in application patterns across users and treatment sites. 

The lipid-based delivery structure is designed to work within the outer layers of the skin (stratum corneum) without disrupting barrier integrity, supporting a formulation-driven and skin-compatible approach to topical delivery. 

The formulation is designed to support a uniform distribution of active ingredients across the application area, providing consistent coverage while maintaining a balanced formulation profile suitable for a range of skin types and clinical contexts. 

  • Supports uniform distribution across the application area
  • Designed for consistent and predictable topical coverage
  • Maintains skin-compatible, barrier-aligned formulation characteristics 

What This Means for Clinics and Patients 

Use of CNANO’s N™ system in procedures requiring topical anesthetic application may support improved workflow integration for clinicians and clinical staff. More consistent application characteristics and predictable usability may assist with procedural planning and reduce interruptions during clinical workflows, including the likelihood of mid-session reapplication in longer procedures. 

From an operational perspective, a more streamlined application process may support more efficient use of clinical time and improved organization of pre- and post-procedure steps. 

From a patient perspective, a more consistent and streamlined application experience may contribute to improved perceived comfort and overall procedural experience. It may also help support reduced risk of post-inflammatory hyperpigmentation (PIH), particularly in contexts where skin sensitivity is a consideration. 

  • Supports improved workflow efficiency in clinical settings
  • Intended to enhance consistency and ease of application experience
  • May contribute to improved patient comfort perception and overall satisfaction
  • May help support reduced risk of post-inflammatory hyperpigmentation (PIH) 

Rethinking Numbing Creams (Clinical Perspective) 

From a clinical practice perspective, variations observed with traditional topical anesthetic formulations, including BLT and LT combinations, are generally associated with differences in delivery system design rather than the activity of the active ingredients themselves. In clinical environments, factors such as onset time, duration of effect, and overall usability may be influenced by formulation architecture and excipient selection. 

In time-sensitive workflows, formulation characteristics such as spreadability, consistency, and ease of removal may influence procedural efficiency and workflow organization. Solvent-based systems used in some formulations to support dispersion of active ingredients may also contribute to variability in skin feel and tolerability, depending on formulation composition and individual patient factors. 

The NOVOLUX™ NanoEmulgel base is a formulation platform intended for use in compounding BLT and LT formulations, designed to support streamlined preparation workflows and consistent handling characteristics in clinical settings. This formulation approach may support more efficient preparation practices and reduced procedural complexity within clinical settings. 

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