I've had minimal rash that healed quickly. Popped blisters & etc. With a blister, it is always best if I can keep it intact for 2 or 3 days. If it pops early, it progresses much like your wound, and seems to take forever to heal, and those are usually small.
It looks like the Day-2 photo should have healed quickly, although it does appear as if you took off a uniform outer layer of skin (whereas I think of rash as being a series of deep scratches).
A little late now, but I'm wondering how you could have prevented the back-slide from day 2. Moleskin? Lots of ointment?
Here is a
discussion of "Abrasion" injury on Wikipedia., along with a series of photos for a hand abrasion, going out a month.
At first glance, your leg looks like it is getting worse. But, I'm seeing a definite pattern of follicles in the last photo (Day 16). That may be indicating that it is, in fact, healing. But, you have to protect that new layer of skin that is forming.
It is up to you as to whether you wish to continue seeing doctors.