The cause of these blisters
Cause of these blister is similar to the big toe and little toe joint blisters, they tend to be caused by a structural problem, usually caused by the big toe joint which isn’t functioning to its full capacity and is compensating by asking the lesser middle three joints to work harder. The lesser joints are not used to this extra work load and blister with the increased shear. The actual toes can also be clawed making the middle three joints very prominent, increasing the weight bearing area and causing blisters under those joints
How to help prevent these blisters
Engo patches applied to the insole inside your shoe, apply on to insole that correlates to blister affected joints.
If you are unsure where the joint is in relation to the insole, then put a fabric plaster on the blister prone joint, mark it with a permanent marker pen and place the foot back in the shoe, the black marker pen should rub off on to the insole. Accurately marking the area of pressure on the insole, apply a oval engo patch on the marked area on the insole.
Poron insoles cushion and encourages the big toe joint to work harder, which in turn reduced the pressure on the middle three joints.
Armaskin liner socks
Armaskin liner socks will also decrease the shear on that area of the middle toe joints but they may not be able to do it totally by themselves and would need additional recommendations as pressure under the balls of the feet is considerable.
Darn tough socks have lots of built-in cushioning in their socks located underneath the sole and that will help with increasing the shock absorption under these joints. Their moisture wicking technology will also reduce any sweat that might be left next to the skin after an activity.
Hoka one one running / walking shoes and boots
are designed with a large shock absorbing rocker sole. From a foot functioning aspect, the middle joint can drop into the shock absorbing sole reducing any pressure on them
Blister prevention Taping with hypafix and KT Pro tape
Will reduce the friction to this area if you are preparing for a lengthy event , we have a video showing you how to achieve this.
Biomechanical Assessment may be required by a Podiatrist if all the measures above have failed to resolve the blisters on these joints. They will be able to establish why these joints are experiencing an increase of pressure to cause the blister in the first place, a podiatrist may be able to make a simple insole or a prescription orthotic to solve the Biomechanical cause of the blisters. https://www.youtube.com/embed/b_cA_Tf4gRQ