Transdermal drug delivery systems have emerged as a major tool for treating skin diseases by delivering drugs through the skin and into the bloodstream. A transdermal patch contains medication that is released through the skin at a controlled rate. Advantages over other delivery methods include reduced pain, avoidance of first-pass metabolism, and convenience of multi-day dosing. The global market for transdermal drug delivery was worth $25 billion in 2013 and is projected to exceed $40 billion by 2018 due to an increasing number of products and demonstrated therapeutic benefits. While successful in niche markets, growth in other areas has been limited. However, research into new applications such as wound care and diagnostics indicates transdermal delivery may play a larger