People with common health conditions, such as diabetes and heart disease, can keep their health condition invisible to the outside world. Unless they want to share their medical history, nobody else need know there is anything different about them. The same cannot be said for skin conditions such as acne, psoriasis and eczema, which, while not lifethreatening, can exact a serious toll on the self-esteem and confidence of people who experience them. While these skin conditions also involve significant discomfort, it is the psychological implications that can stay with people throughout their lives.