Ultra-clickable YouTube medical thumbnail, 16:9, photorealistic, bright clinical-editorial style with high contrast. Close-up split-face composition of a woman's face (Maya) divided exactly down the center: left half shows classic allergy symptoms — a bright itchy watery eye, mid-sneeze motion blur, and faint pollen particles glowing in soft yellow-green light drifting past her face; right half shows sinus infection symptoms — a hand pressing on a visibly reddened, inflamed cheek and forehead area with a subtle translucent red-orange glow beneath the skin indicating swollen sinus pressure, tired strained expression. A thin glowing white dividing line runs down the center of her nose separating the two halves like a diagnostic split-screen. Background left side is soft airy daylight with blurred spring greenery and floating pollen; background right side is warmer, dimmer, and slightly clinical with a faint blurred sinus anatomy diagram glowing behind her. Sharp macro focus on both eyes, shallow depth of field, clean modern health-channel color grade (fresh green-yellow vs warm red-orange). Huge bold black and red impact-style text at the top: 'ALLERGIES OR SINUSES?' and bold yellow highlighted text below: 'WHAT YOUR SYMPTOMS ARE REALLY SAYING'. Small clean subtext at the bottom: two labeled arrows pointing to each face half reading 'ALLERGY' and 'SINUS INFECTION'. Extremely high clickthrough YouTube thumbnail aesthetic, crisp readable typography, no clutter, professional trustworthy medical-channel look.
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