I Have A Healing Chemical Burn Two-thirds The Way Down

I have a healing chemical burn two-thirds the way down my calf, atop the shin. (The scanned burn are three parallel lines about1/3" tall and 1/8" wide; deck stripper was the chemical). It's been tender the last two weeks and now when I press the skin 1" away from the main burn area, the skin indents. The intention is only on the shin bone

Any clue?