Rosacea is a common rash, found on the central part of the face, most commonly occurring in middle age although it can happen in a young adult. A tendency to flush easily is followed by persistent redness on the cheeks, chin, forehead, and nose. The cause of rosacea is not fully understood, but many think that the defect lies in the blood vessels in the skin of the face, which dilate too easily. Genetic, environmental and hormonal factors have also been suggested. There are several different forms of rosacea, with each varying widely in symptoms and demographic. Rosacea is more common in women than in men and in those with fair skin who flush easily. The skin can become red and sore to the touch. A rash of bumpy spots (papules) and pus-filled pustules can appear across your nose, cheeks, and forehead. Rosacea is usually only a cosmetic skin disorder.