7% Lidocaine/7% Tetracaine Cream Versus 2,5% Lidocaine / 2,5% Prilocaine Cream

Inclusion Criteria: * • Subject has provided written informed consent; * Subject is ≥ 18 years of age at time of screening; * Group A: subjects with acne keloidalis nuchae; * Group B: subjects with an uniform, black, professionally placed tattoo Exclusion Criteria: * • Known sensitivity to any components of the test materials; * Pregnant or breast-feeding women; * Use of any other pain medication during past 24 hours prior to the laser treatment; * Damaged skin at the designated treatment site; * Blister formation and/or scar formation after test-treatment with standard laser settings; * Any medical or psychiatric condition which, in the investigator's opinion, would preclude the participant from adhering to the protocol or completing the study per protocol.