There is no such thing as a painless electrolysis. It is impossible to destroy hair growth tissue without sensation because each hair follicle is surrounded by its own network of nerve endings. The sensation, which may be felt, is assurance that destructive activity is taking place. Even though some parts of the body are more sensitive than others, adjustments can be made which may help to make the treatment more comfortable. I recommend the use of topical anesthetic cream, especially for the upper and lower lip.