I had chicken pox as a kid and came out of it with a few scars. There is one in particular that is concerning. The one on my outer left thigh. The problem is that its still round shaped but its raised significantly. All the other scars are still the same size as before with no change. The one on my thigh is flesh colored and has a spongy feel to it. What does this all mean? Why did this scar change like this? Is this normal?

Being nobody has a crystal ball... and the fact that early detection is key in the worst case possibilities... when in doubt, have a medical professional examine this.