This is the same answer I have received in the past. But it has been at least 7yrs from the first incident and it seems to have gradually expanded slightly upward from the ankle(s). above the original damage and appears like brownish freckles. The original injury site(s) are still very dark.
The skin is tough and after sitting in the evening for a couple of hours it feels a bit numb and tight.
There is no itching or pain.
Is there a treatment? laser perhaps?