Numbing creams, also known as topical anesthetics, reduce discomfort by temporarily blocking nerve signals in the applied area. These creams often contain active ingredients like lidocaine or a combination of lidocaine and prilocaine, which penetrate the skin to numb underlying nerve endings. They are commonly used before minor medical procedures, cosmetic treatments like laser hair removal or tattooing, or to alleviate pain from minor skin irritations.
Typical Application Duration
Most over-the-counter numbing creams generally need to be applied for 30 to 60 minutes before a procedure to achieve their full numbing effect. Lidocaine, for example, starts numbing within 25-30 minutes. The numbing effect typically lasts for 1 to 3 hours after the cream is removed.
It is important to always consult the specific product instructions for the recommended application time, as this can vary between brands and formulations. Some products might suggest leaving the cream on for up to an hour or even 90 minutes, especially for procedures like tattooing. Adhering to these guidelines helps ensure the cream works effectively and safely.
Factors Affecting Application Time
Several elements influence how long numbing cream should remain on the skin for optimal effect. The type of procedure plays a role; for instance, some tattoo artists recommend 60-90 minutes for deep numbing, while minor injections might require less time. The concentration of active ingredients, such as lidocaine, also affects the onset and duration of numbness.
The area of application can impact absorption rates; thinner skin areas may become numb more quickly compared to thicker skin. Individual sensitivity and metabolism also contribute to individual response and duration of numbness. To maximize penetration, applying a thick layer and covering the area with an occlusive dressing, like plastic wrap, can help active ingredients absorb deeper into the skin.
Potential Dangers of Prolonged Use
Leaving numbing cream on for too long or applying excessive amounts can lead to serious health complications. Active ingredients can be absorbed into the bloodstream, causing systemic toxicity. This can result in adverse effects such as irregular heart rhythm, seizures, and difficulty breathing. In severe instances, it can lead to coma or be life-threatening.
Applying numbing cream to large areas of the body, especially if the skin is irritated, broken, or covered with a dressing, increases the risk of systemic absorption. A rare but serious blood disorder called methemoglobinemia can also occur, particularly in children, where the blood’s ability to carry oxygen is impaired. Prolonged numbness can mask pain signals, the body’s natural warning system, which can hide potential injury or complications during a procedure.
Safe Removal and Post-Application Steps
Once the recommended application time has passed, remove the numbing cream properly. The treated area should be thoroughly washed with mild soap and water to remove all cream residue. After washing, gently pat the skin dry with a clean towel.
Ensuring no cream remains on the skin prevents continued absorption of active ingredients and reduces the chance of irritation. Some procedures may benefit from specific post-application care, such as applying a soothing lotion, based on the procedure’s requirements and professional guidance. Following these steps helps maintain skin health and minimizes lingering effects from the cream.