Chafing on thighs,stings alot?

I have really bad chaffing,especially in the summer! Today (England) was SO HOT! and,i was achy on my thighs,whenever i walked it would sting. I had this last year in the summer aswel. I use Sudo Cream but can i use something else? I might have to start using it in the morning aswel :/ I need to lose weight so that's one solution but what else can i do to stop chaffing?