I would be careful with the lidocane treatments
It is important to note that these effects can result from excessive topical use or misuse of lidocaine as well. For example, covering a large area of the body with lidocaine or leaving it on the skin for a long time can lead to absorption of the drug into the bloodstream. This can also occur when it's applied to skin that is not intact such as open wounds, blisters, or burns. Wrapping the treated area also increases absorption.
Another serious effect of lidocaine is a condition known as methemoglobinemia. Lidocaine can impair the ability of iron in red blood cells to carry oxygen to the tissues. Methemoglobinemia is the condition of having blood that has this altered kind of iron. Methemoglobinemia can result even from normal use of lidocaine, especially in children. Because the blood is not able to carry enough oxygen to the tissues, people with methemoglobinemia appear very pale or even blue, feel very tired, and have shortness of breath. Methemoglobinemia can be life-threatening.
