If you have these rashes in the folds of your skin, under your breasts for example, they can easily become infections. You can try using an anti fungal cream. Weirdly, what worked best for me was the yeast infection treatment cream. You can get the one with the external cream tube or you can just squeeze it out of the suppository tube into a clean, glass container and use as needed. Cleared up the heat rashes I used to get almost immediately.