Yeast is a normal inhabitant of the intestines of healthy men and women and the vagina in women.
It is unusual for normal, healthy people to develop skin rashes from yeast, but people with immune defects, such as those caused by diabetes or HIV, often are plagued by yeast rashes. So, when normal healthy people develop rashes caused by yeast, doctors should look for a cause. There are many different types of yeast. Most are harmless and do not cause skin rashes. Genital infections caused by yeast are often associated with a special type of yeast that is able to break though the skin to cause a red, itchy rash.