you can't afford leuko tape. if you want to keep walking, you're about in a position that you can't afford Not to buy it.
there has got to be 12 dollars worth of slack somewhere in your budget. we're not (yet) in that financial disaster where things like this are real. not yet at least. soon enough we will be. but before that, buy some tape.
the $12 x 15 yd roll is 45" which is roughly 30 tapings = what ? that's 40 cents a tape job. ok, 50 cents including the ones you muck up.
you can afford it.
so, it's 12 bucks a roll. you can get it from vitality medical. and you can get that tincture of benzion along with it.
now... let's just say you soon have this super duper tape, and your benzion. the benzoin is spendy sticky stuff that will not want to spill.
the tape is not infinitely sticky. in fact, it's only sorta sticky. the magic of it's stick is in the longevity, not in any particularly tenacious heroic bonding. the benzoin helps it stick good over time. they work together. you need both.
this is what peter would do. (and does)
afford a 1oz nalgene plastic bottle too. make sure it is either clean and very very dry, or brand new.
water in the benzoin seems to allow it to consume the nalgene.
find some open cell foam about 1/2" thick.
cut your foam into a wedge shaped format about 6 to 8" long, by however tall it needs to be to slightly crown out the bottle when you roll it EXTREMELY tightly and shove it in there.
shove down alongside the foam something to let the air out, and slowly drip the benzion into your bottle.
now you have a bottle of benzion that will last you several weeks of walkng and will not spill if you knock it over inside your tent.
(i will be selling this rig soon enough, but it's not eff'n rocket science to make one)
coat you heel in the area you want, and above and below the zone.
unroll the tape a bit and don't sweat the corners.
when you tape the area, don't dwell a bunch on making one stripe of 1-1/2 tape do it all. aim a bit off to one side. the second strip will overlap and that will make it plenty plenty wide. go down below the heel and under the foot several inches.
do NOT let your foot bend over 90° when taping, because if you do, the tape will be wrinkeled, and you won't like that.
let the tape be a little bit under tension in service. it will creep in a few hours and be dead flat no wrinkles sweet.
you can leave it one several days at least. no big deal.
and if there is a blister, screw it, just benzoin and tape right over that puppy. the alcohol will kill and redness in a few hours.
so there. that ought to protect your heel area from any attack of your shoe. take a Very long look at the shoes too.
what changed in your foot ?
perhaps, you might do yourself a favor and lookup a thing called a "pump bump" because that's what i got, and i've had a bone just come storming out the back of my foot two years ago in the arctic. it was quite depressing. was like my body turned on me.
but with a bit of creative taping, plus some minor surgery and removal of heel paddig inside my boots, i was up and running again over 300 miles of ice and wet puke this summer.
so, a pump bump might be the villain, and they are all but functionally inoperable due to excessive recovery time.
or .. it might not be.
hope some of that might help.