Like many consumer products, a small number of individuals may experience reactions such as redness, rash, and/or swelling upon prolonged or repeated skin contact or eye contact.http://unilevermsdsusa.com/Document/37/71/314f0bf7-16d9-4421-9b3a-2aaaee60321e.pdfI also (just) called the company because I know a lot of people leave this particular product in.