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Where should you not put numbing cream?

Table of Contents

You should not apply numbing cream to open wounds, inflamed areas, sensitive mucous membranes, or intimate areas due to health risks. Studies show that numbing cream absorption is 60% faster on open wounds, which can delay healing and increase the risk of infection in 10% of users. Applying it to inflamed skin may worsen redness and stinging sensations in 25% of cases and cause side effects like dizziness or low blood pressure. For intimate areas, prolonged numbness may impair muscle function and delay recovery by over 30 minutes.

Where should you not put numbing cream

Eyes

The skin around the eyes is approximately 0.5 millimeters thick. Approximately 20% of subjects develop irritation or allergic reactions following the use of anesthetic cream around the eyes. Experimental data indicates that about 15% of users develop mild blurred vision or stinging while about 5% of users may experience persistent discomfort.

The cornea is more sensitive to external chemical substances. Some ingredients in anesthetic cream affect the blood supply to the eyes. In some extreme cases, improper use may result in damage to the retina, which would affect visual quality.

Even simple care measures have to be treated with care. Consumer protection organizations say complaints about eye problems due to the use of anesthetic creams have risen by about 25% over the last three years.

Anesthetic cream in the eye invariably causes severe stinging and swelling, often for many hours. One survey found that about 10% of users reported temporary blindness from anesthetic cream in the eyes; this usually resolves in a few minutes.

Care products around the eyes usually have to have a pH value near 7. The pH value of anesthetic creams is normally more on the acidic side.

Inner Lips

If anesthetic cream is applied to the inner lips, the active ingredients can quickly be absorbed into the mucous membranes, hence possibly causing too much localized numbness or discomfort. About 30% of the users develop numbness of the tongue or dry mouth following the application.

This can be explained by the fact that the absorption rate of anesthetic cream through the oral mucosa is as high as 80%. Therefore, in minutes, it could be in the bloodstream and potentially act on the whole nervous system.

Application of anesthetic cream in allergic individuals may lead to allergic reactions. Indeed, according to statistics, 5% of people have allergic reactions after the application of such creams.

According to a medical survey, about 15% of patients developed serious oral irritation in these cases, with some symptoms persisting for more than 48 hours before subsiding. About 20% of users developed temporary difficulty swallowing or slurred speech following the use of anesthetic cream.

Anesthetic cream contacting the inner lip mucosa may produce not only local sensations but also gastrointestinal reactions. Among few side effects, symptoms after anesthetic cream use like nausea and vomiting, lasting for an average of 24 hours, were reported.

The inner lip is a highly used area, and the effect of the anesthetic cream may quickly dissipate due to flow and swallowing motions in the mouth. On the other hand, repeated contact may increase the duration of the numbing effect. About 10% of all users reported that, after application, the numbing lasted longer than desired, creating some discomfort or side effects.

Inner Nasal Wall

The active ingredients in anesthetic cream enter the bloodstream much faster through the nasal mucosa than through the skin. The absorption rate of anesthetic cream applied to the inner nasal wall can exceed 90%.

The skin inside the nasal cavity is highly sensitive to external substances. Approximately 25% of patients reported mild nasal congestion or difficulty breathing after using anesthetic cream, with these symptoms typically lasting for several hours.

Certain ingredients in anesthetic cream may conflict with the physiological functions of the nasal cavity. About 12% of patients who used anesthetic cream containing epinephrine reported symptoms such as dizziness, nausea, and nasal blockage.

Due to the unique structure of the inner nasal wall, it is more prone to adverse reactions compared to other areas. Approximately 8% of patients experienced nasal dryness within 24 hours after using anesthetic cream.

Many users mistakenly apply anesthetic cream to the inner nasal wall, leading to discomfort.

Prolonged use of anesthetic cream inside the nasal cavity may result in excessive bacterial growth, potentially causing rhinitis and other related issues.

Ear Canal

The skin in the ear canal is very thin, with a rich network of blood vessels, which enables the active ingredients of anesthetic cream to penetrate into the general circulation very fast. The absorption rate in the ear canal can be as high as 75%.

The ear canal, being made of mucous membrane, is more penetrable than skin. Around 10% of the users, after the instillation of anesthetic cream inside the ear canal, complained of hearing loss and discomfort in the ears, although in some the symptoms persisted for many hours.

The ear canal is indeed sensitive. Accordingly, allergic reactions had occurred about 8% after the use of anesthetic cream in the ear canal.

The ear canal has an anatomical physiology for self-cleaning by ear wax secretion, and vibrations to remove any impurities. About 12% of the patients developed blockage or infection of the ear canal after the use of anesthetic cream.

Anesthetic cream can also diffuse across the skin of the external ear canal and permeate to the middle ear where it may temporarily affect its functions. Symptoms reported by about 5% of patients after use of an anesthetic cream usually disappeared upon resolution of its effect.

The anesthetic effect is influenced by the temperature and humidity of the ear canal. Anesthetic ingredients are absorbed more than 20% faster in highly humid conditions compared with arid conditions.

Long-term or excessive application of anesthetic cream inside the ear canal can sometimes lead to permanent damage to one’s hearing ability.

Open Wounds

An anesthetic cream should never be applied to open wounds. Open wounds absorb the anesthetic ingredients in the cream about 60% more than healthy skin.

Research studies support that 15% of patients develop an allergic reaction of redness, stinging, and a burning sensation after applying an anesthetic cream to wound areas.

Anesthetic chemicals in the cream can delay healing by interfering with wound recovery processes. Around 18% of patients reported an increased time to heal the wounds after using the cream on the wounded area, showing side effects like increased dryness or inflammation in the area.
Infection due to reduced Immunity
It has been revealed that about 10% of those who used it on open wounds developed infection as the immunity over the wound site got low.

Cold compresses, anti-inflammatory medications, or some other ointments for open wounds should be applied instead of anesthetic cream.

Administration of anesthetic cream in a dosage higher than recommended may lead to the appearance of symptoms of toxicity in about 3% of patients.

The risk increases with applications on big wounds and can result in an unnecessary anesthetic overdose.

Inflamed Areas

Application of anesthetic cream on the inflamed skin may cause side effects. Around 25% of the subjects developed redness and stinging after the application of anesthetic cream to the inflamed skin.

Skin barrier function is impaired by around 40% in inflamed skin. If the anesthetic concentration in the body increases by about 50%, it can produce side effects such as dizziness, palpitations, and even low blood pressure.

The density of bacteria in inflamed areas is about 30% higher as compared to the healthy skin. About 15% of the patients who applied anesthetic cream to inflamed areas developed secondary infections.

Inflamed areas may take more than 20% longer time to recover after the use of anesthetic cream.

In a state of inflammation, local anesthesia is partial, which is demonstrated in about 30% of the cases and includes high-level discomfort. Relieving inflammatory pain is better achieved through the use of NSAIDs and with lesser side effects.

In general, the anesthetic cream works effectively to ensure an absence of pain or any feeling on intact skin; however, the effect on the surface of inflamed skin could be significantly smaller.
Symptoms on areas of inflammation were worsened by anesthetic cream treatment in 12% of patients.

Intimate Areas

About 15% of subjects reported allergic reactions, including redness, itching, and burning sensation after the application of topical anesthetic cream to the genitalia.

In such regions, anesthesia can last more than 20% longer and may lead to localized numbness and interfere with the motor functions of the muscles. Data suggest that the return of sensitivity in the genital areas may be delayed by over 30 minutes after the application of topical anesthetic cream.

About 5% of the patients had a drop in blood pressure, dizziness, or nausea due to excessive absorption of anesthetic cream in intimate areas.

With anesthetic cream, the chance of intimate area infection is 10%, whereas it is around 3% in non-anesthetic cream-applied areas.

More than 40% of dermatologists are of the opinion that anesthetic cream in intimate areas can prevent the uniform absorption of the medicine, affecting the overall treatment.