Why does the weather get a little warmer and blisters on my feet? How to treat it?

This is probably a tinea pedis disease caused by fungal infection, leading to rash and blisters. Generally speaking, it is recommended not to wear airtight shoes, or just walk barefoot for a while, and not to wear shoes and socks (it is recommended to walk barefoot on the beach when the sun is hottest, so that sand or dry soil can enter between your toes). It is recommended to use Yikeji bacteriostatic spray externally and try to spread comfortable shoes. Secondly, if you have symptoms, you can consider local treatment and soak your feet more.