Numbing creams are topical preparations designed to reduce sensation in the skin, temporarily blocking nerve signals to alleviate discomfort. They are commonly employed before minor medical procedures such as injections or blood draws, and for various cosmetic treatments like tattooing, piercing, or waxing, making otherwise uncomfortable experiences more tolerable.
How Numbing Creams Work
Numbing creams typically contain active ingredients known as local anesthetics, such as lidocaine, prilocaine, benzocaine, or tetracaine. These compounds function by penetrating the outer layers of the skin to reach the nerve endings. Once absorbed, they temporarily block the sodium channels within nerve cell membranes, preventing the nerves from generating and transmitting pain signals to the brain.
The interruption of these electrical signals means that while pressure or touch sensations might still be perceived, the feeling of pain is significantly diminished or eliminated in the treated area. This effect is temporary, as the body gradually metabolizes and clears the anesthetic from the site, allowing normal nerve function and sensation to return.
Determining Application Time
The duration a numbing cream should remain on the skin varies significantly, depending on factors like the cream’s concentration, the specific area of the body, the type of procedure, and individual skin sensitivity. It is always important to consult and follow the product’s instructions for optimal and safe use. Skin thickness, blood circulation in the area, and the presence of occlusive dressings (like plastic wrap) can also influence how quickly the cream takes effect and how deeply it penetrates.
For many topical anesthetics, the onset of numbing typically begins within 25-30 minutes, with optimal effects often observed around 35-40 minutes after application. However, deeper numbing, which may be needed for certain procedures, can take longer, sometimes up to 60 to 120 minutes to achieve a depth of 3mm to 5mm. For tattoos, it is generally recommended to apply the cream 60 to 90 minutes before the session for adequate numbing. Some sources suggest 45 minutes can also be sufficient. For longer tattoo sessions, reapplication might be necessary.
For piercings, a common recommendation is to leave the cream on for about 60 minutes before the procedure. Some piercing professionals advise a 30-60 minute application time. When preparing for waxing, typical application times range from 20 to 45 minutes, though some products may suggest up to 60 minutes. For injections or other minor medical procedures, applying the cream 30 to 60 minutes beforehand is often recommended. Products like EMLA cream may require at least 60 minutes for proper pain relief. For microneedling, an application time of 20 to 45 minutes is commonly advised before the procedure.
Safe Use and Removal
Leaving numbing cream on for too long can lead to potential risks, ranging from localized skin reactions to more serious systemic effects. Common local side effects include temporary redness, itching, mild burning, or swelling at the application site. If these symptoms become severe or persistent, remove the cream immediately. Prolonged application, especially over large areas, on broken or irritated skin, or under occlusion (such as plastic wrap), can increase the absorption of the active ingredients into the bloodstream.
In rare but serious instances, excessive systemic absorption can lead to adverse effects like irregular heartbeat, seizures, or difficulty breathing. Signs of a more severe reaction, such as hives, swelling of the face, lips, tongue, or throat, dizziness, or confusion, warrant immediate medical attention.
To remove the cream, wipe it off thoroughly with a clean cloth or paper towel. Afterward, wash the area with soap and water to ensure all residue is removed. Some individuals may apply a thin layer of soothing ointment as part of aftercare.