Episalvan is a recently approved (2016) compound used to treat skin wounds such as burns and grazes, or following surgical skin grafts.
It was originally based on a traditional herbal remedy, and is an extract from the bark of the Birch tree Betulae cortex.
The exact way Episalvan works is not fully understood. It is thought that the active substance in Episalvan, birch bark extract, helps the cells that make up the outer layer of the skin (keratinocytes) grow and move quickly towards the gap created by the wound, therefore helping wounds to heal faster.
Source : European Medicines Agency