Likely Suspect: Rosacea, a chronic disorder involving the dilation of blood vessels. “It’s extremely common and underdiagnosed,” says Hale. “As you age, the redness progresses because the capillaries tire out and burst.” That redness flares in response to extreme temperatures, spicy foods, alcohol, sun exposure, and stress. Identifying and avoiding these triggers is the best way to keep rosacea in check. Wear broad-spectrum SPF 30 or higher every day. Avoid using cortisone to reduce redness; instead, try a redness-reducing cream, like Neocutis Pêche Redness Control Cream ($105; dermstore.com). A dermatologist may prescribe a topical cream, like Rhofade or Soolantra, or a low-dose oral antibiotic, like Oracea. Or she may recommend pulsed-dye laser treatments to erase red surface capillaries, though you’ll need touch-ups every year or two.