Rosacea is a condition of the skin wherein one has chronic facial redness. This may cause the skin to produce pus-filled bumps. This may flare up for weeks or months. Rosacea can be mistaken for other skin problems like acne and the like. Yes, you can still use blush to balance and cancel out the redness. This will help you have a more neutral canvass to work with. You may also use concealers to help correct the color.