There are four stages of rosacea: pre-rosacea, mild rosacea, moderate rosacea and severe rosacea.
Pre-rosacea: People who are prone to flushing or blushing are considered to be in stage one, otherwise known as pre-rosacea. Hot or spicy foods, vigorous exercise or embarrassing situations can prompt flushing or blushing which disappears shortly after the trigger is removed. The blood vessels start to become more sensitive, but there are no signs of damage to the blood vessel walls.
Mild rosacea: This stage begins when facial redness remains long after the trigger has been removed. This often lasts for half an hour or more. The blood vessels have sustained minor structural damage.
Moderate rosacea: Facial redness persists for days or weeks. There may be outbreaks of papules and pustules and people may experience swelling or burning sensations.
Severe rosacea: A small percentage of rosacea sufferers experience stage four rosacea. Severe inflammation can lead to pain, debilitating burning, as well as swelling and intense episodes of flushing. Blood vessels are extensively damaged and leaking. Some people develop rhinophyma, a bulbous enlargement of the nose.