I have exactly what you describe LiquidFeet, my feet are still worked over from last year's downsize to a low volume boot. It was very prominent back in May but not so bad now. I think it's mostly old age and a loss of collagen in the skin.
First, it would lower the shear on your skin, because the foam you add would be against, maybe taped, to the shin instead of moving with the boot.
Second, properly shaped, it shouldn't add compression, not if you actually have room to flex the T. anterior as you mention above.
If you don't have room there, then you're flexing the muscle into the liner, and it all becomes a bit self explanatory along the lines @Dakine outlined.
....What’s the shape of your boot tongue? Some can be better than others at slowing the shin down less abruptly. If it’s kind of a soft V shape, (in plan), it will contact the outer parts of the shin first, then by the time you’re nearly all the way forward, the center contacts. Might help....
Edit: read above, was going to suggest the unbuckling also, but maintain booster strap/power strap. See what happens.
How long does it take to appear?
Since so many of you don't experience this, I'm wondering about my boot tongues now that James has brought them up. I have very, VERY narrow lower legs just above the ankles, so I have added all kinds of filler around the cuffs in that area to maintain contact. I have duct taped Eliminator tongues onto the Zip Fit tongues. The omfit just doesn't do the task all by itself. I'm now thinking I should revisit that. Thanks for the refocus.
Pretty funny to read this after you objected about adding pressure further upthread. Especially since the foam I linked to is specifically designed to alleviate bedsore ulcers and therefore much more compliant than the Eliminator tongues.
At the end of last season I noticed a small dark spot on my right leg at the top of ankle/bottom of shins and slightly to the inside of the shin not dead center. It is not painful and is now less dark but I have not been out skiing yet this season. I thought it was like a black and blue mark but it has not gone away just less dark as I said earlier. I also thought it was just my age 72 at the end of last season and will be 73 this month, I may heal slower now and just haven't healed yet.
The EVA foam is generic; the Akton polymer is this stuff:
you want the 1/8" - put it in the sock to start with.Akton Padding
<ul><li> Use in gloves, splints and footwear to help diffuse and distribute pressure</li><li> Helps disperse energy from impacts and reduce skin shear</li><li> Will not bottom out</li></ul>www.medline.com
Arnica Gel (Wamart) rub it in as it helps with local circulation to help with bruising. Basically low dose sodium heparin from nature.Deep tissue bruise? Those take months to come out.