Doctors don't know the exact cause of rosacea. Some doctors think rosacea happens when blood vessels expand too easily, causing flushing. People who blush a lot may be more likely to get rosacea. It is also thought that people inherit the likelihood of getting the disease.
Though not well-researched, some people say that one or more of these factors make their rosacea worse:
Intertrigo is a fancy name for a rash that shows up between the folds of skin. It is a very common skin rash that can crop up throughout life.
The most common areas affected include larger skin-fold areas such as:
Beneath the breasts