Patch Testing is a procedure for testing a customer's skin for any allergic reaction from a substance that is going to be used for the procedure that he or she desires to undergo. It involves placing a few drops or a small amount of the substance on the skin, leaving it for 48 hours for observation for potential reaction or effects which may include rashes, infection, or any skin irritation. Patch Testing is one of the classic methods for checking with a client if he or she has any allergic reaction to any of the creams or skin applications that shall be used on him/her. This way, we can safely proceed with the procedure if no allergic reaction happens after 48 hours. Although a patch test is made, however, this is not a guarantee that the client will not have any further allergic reaction.