As most hair systems must attach to the scalp at points of contact, the usual method is through the use of tapes or glue. In both cases, skin sensitivity is always to be considered first, in order to avoid allergic reactions, such as rash or hives. To avoid this, apply a small amount of tape or glue to skin on your neck and wait 5 minutes to see if there is a reaction. If so, avoid use of the item and try a different vendor’s product or type, until no adverse reactions occur.