Girl with giant facial mole has egg-like devices implanted

A woman has had four balloons implanted under her skin to save her life because doctors fear the birthmark that covers half her face could become cancerous.   Xiao Yan needs the bizarre treatment to allow her to grow new tissue that doctors can use to graft onto her face when the birthmark is removed.    The 23-year-old, from Longjing Village in Guizhou Province in south-western China, suffers from a rare skin condition called congenital melanocytic nevus which affects just one in 500,000 peo...