i am 39, 5 feet 3 inches in height and about 60kilos. I had broken leg 7 years ago and undergone an operation. I had a plates in my bones for almost 3 years and decided to remove it a year ago through another surgery but after a year i noticed that an itchy insect bites on top of it became darker and does not heal for a month and it seems bigger dark soft spot now. What is this?