Ohhhh....I know exactly where you mean! I used to get blisters there but my feet just kinda toughened up. so now I have hobbit feet but a lack of blisters. I used to find that putting talcum powder on my feet helped stop them developing as well as it made my feet less sweaty (ewwww) so they didn't slip around and create as much friction to blister.
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I only wear doc martens and breaking them in can be like chewing glass lol. It's probably not helpful now but after getting new footwear it's a good idea to wear them around your home for a little while to find out where bits might rub and cause blisters, then you can put plasters on those places to enable you to wear them without causing blisters.
I've found once you get blisters it's better to let them fully heal before trying to wear the shoes again. Then when you do wear them again, if you can, take some comfortable shoes with you when you go out so you can change them if they start to cause you trouble.
^ I've found rubbing vaseline into leather helps too. Also, using your hands to physically bend the footwear where your foot would bend it (hope that makes sense). So that way your hands are doing the work your foot would be doing, the exception being your hands won't blister as your feet will.
I've personally found that the best plasters to use are the fabric type ones, I find they stay in place longer and will stretch and bend as your foot moves.
I think you might be best off gently cleaning it with warm water, anything more harsh might not aid healing, healing tissue can be quite sensitive. Or a sea salt soak solution (a generous pinch of salt per pint/500ml of warm water) I've often cleaned blisters with a gentle sea salt solution.
I've left plasters off during the night and then used them in the day when wearing footwear, then when I get home gently cleaning blisters and leaving them to air dry. Although if it's a blister that's quite "wet" producing a lot of lymph fluid then I dress it.
I don't think enough people (myself included!) are patient or organised enough to break shoes in as much as they need. It's naive to expect new leather sandals NOT to give you cuts and blisters, unless you give them time to warm up and stretch to the shape of your feet. I know this, but every time, I go out and buy shiny lovely new shoes then try to wear them all day, only to cry and never wear them again. :-P
I usually find that covering my feet with blister plasters before I put new shoes on helps best, if I need them right away. Or I wear them for an evening in my room and look at which parts of my feet go red, then cover those.
I swear by putting new shoes in the tumble dryer (if it's safe to) for 10 minutes and wacking them on my feet as soon as they come out and the material is warm and walking around the house for 20 minutes in them :)
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