Tinc benz brings back some horrible memories, It hurts like a barsteward but works. I once had a very sadistic army medic suck the fluid out of a big heel blister and inject the bloody stuff under the skin. Absolute pull me down off the ceiling pain for a bit then zinc oxide tape over the heel and soldier on.
Best blister treatment ever! How long was it before you ever got another blister in that spot again? Or went to your medic complaining of a blister
(note- if you're going to try this at home make sure that after injecting the tincture you suck it back out, you only need enough to get the flap to stick to the flesh, otherwise you risk tissue damage from the alcohol)