The photo shows diffuse cheek redness/flushing, and the fact that it is triggered by heat or hot drinks sounds more like a vascular skin response than a facelift healing problem alone. At 15 months, routine surgical redness should usually be much improved, so persistent flushing can overlap with rosacea, sun damage, sensitive skin, visible capillaries, or scar-related vascularity. A check with your surgeon and, often, a dermatologist is worthwhile to confirm the cause. Treatment may include trigger control, daily sun protection, topical medicines, or vascular laser/IPL if appropriate. If redness becomes painful, warm, swollen, one-sided, associated with fever, drainage, or rapidly worsens, you should be evaluated promptly.