What are some possible complications?

Itching : Some itching commonly occurs and lasts only a few days. Shampooing the hair daily will help the discomfort.
Swelling: There is some swelling in nearly all cases. It affects the forehead and the area around the eyes and lasts two to five days, being maximal on the fourth day. However, it does little harm and lasts no more than a week.
Infection : This happens in very rare cases and is easily cured with antibiotics.
Scarring: Keloid scarring occurs only in pre-disposed individuals.
Neuralgia : Once in a while some patient reports varying combinations of symptoms, usually lasting for one to four weeks. Very rarely have patients had neuralgia last a longer time period. Prolonged or severe symptoms are exceedingly rare and virtually always disappear within a few months.