I get red spots on my face out of sudden. it usually comes on my cheeks area or in rare cases on forehead. it remains for 20 to 25 minutes and disappears?

Rosacea: You are probably experiencing facial flushing which at this point in your life is transient. Unfortunately, as the condition worsens, your blotchiness may not fade so fast and you might start developing a pimple like rash which resembles acne. You can slow the progression of this condition by wearing spf 30 sunscreen daily and avoiding excess caffeine, alcohol, and hot spicy food intake.