After a procedure the area will be darker, more intense. This will last for a few days until the area exfoliates and the true colour emerges. Generally it is only you notices the darker colour. Swelling will go down usually by the end of day. It is suggested that if you are having an eyeliner procedure that you bring a pair of dark glasses with you/as you may look as if you have been crying./ A little inconvenient but long term results are well worth it.
(Image source: Wikipedia.org)