Warning, tmi topic, but I need help. Dr isn't open today.

So yea this is embarrassing but googling isn't helping me. I am overweight and I have this red, itching/burning between my thighs (groin area) it's some sort of rash but I also think it's a yeast infection of the skin by what I have read. Question is, what do I do about it? What can I buy to help the itch/burn and to get it to go away? I've been keeping it clean and dry but it seems to keep moisture down there. Please help. Thank you.