I'm no doctor but I'm pretty sure that's from the laces on eyelets 1/2 digging into your leg when you flex forward. It looks very similar to what I had.
It takes a couple months to heal, a week or two won't do it, doesn't matter what you do to your skate it'll flare up. What you need to do is relieve the pressure from that location. lace extenders is one way, skipping the 1st eyelet is another, idea is the same. What doesn't work is more material in that area, as it'll just add pressure.