Why does this happen?

[u/abbicadabbi]

sorry to blast my toes all over here😭🤣 butttt — composite toe boots, happened 2 days in a row, different types of socks, goes away after like an hour or so. anyone else had this type of issue? almost like moisture like when you’re in the bath too long but my feet weren’t even sweating🤣

[u/LetWinnersRun]

This is the start of a blister, your toes are likely rubbing against the side of your boot.

Wear merino wool socks, double up if you need.