Which of the following factors is known to aggravate or trigger rosacea?

Exercise is often cited as a factor that can aggravate rosacea symptoms. While physical activity is generally beneficial for health, it can lead to increased blood flow, elevated body temperature, and sweating. For individuals with rosacea, these physiological changes can trigger flushing and redness in the skin. The skin's sensitivity in rosacea sufferers means that the heat generated from exercising can exacerbate their condition, leading to more noticeable symptoms.

In contrast, cold temperatures can sometimes be soothing for rosacea-affected skin, as high heat and humidity are more typically known to provoke flare-ups due to their effects on skin temperature and blood vessel dilation. Excessive caffeine, while it can cause temporary increases in heart rate and may lead to flushing for some people, is less consistently linked to rosacea exacerbations than exercise. High humidity might not directly aggravate rosacea but can contribute to discomfort and skin irritation for those affected.