Atopic Dermatitis (Eczema): This is a common condition characterized by itchy, inflamed skin, often appearing on the face. The chronic nature of the symptoms (one year) and the presence of itchy papules are consistent with atopic dermatitis.

Contact Dermatitis: This condition occurs when the skin comes into contact with an allergen or irritant, leading to itchy papules. Given the location on the face, common culprits could include cosmetics, soaps, or metals in jewelry.
Seborrheic Dermatitis: Characterized by a red, itchy rash, often on the scalp, but can also appear on the face. It's known for its chronic nature and can be exacerbated by stress and cold weather.
Rosacea: Although primarily known for causing redness and acne-like symptoms, some forms of rosacea can present with itchy papules, especially if there's an associated dermatitis component.

Cutaneous T-Cell Lymphoma (Mycosis Fungoides): A rare type of skin cancer that can present with itchy, persistent patches or papules. Early diagnosis is crucial for effective treatment, making it a "do not miss" diagnosis despite its low likelihood.
Bullous Pemphigoid: An autoimmune disease that can cause itchy blisters or papules. Although less common, its potential for significant morbidity if untreated warrants consideration.

Sarcoidosis: A condition that can affect multiple parts of the body, including the skin, and may present with itchy papules among other symptoms. Its rarity and systemic nature make it less likely but still a consideration in a differential diagnosis.
Dermatographic Urticaria: A condition where lightly scratching the skin raises wheals, which can sometimes be mistaken for itchy papules. It's relatively rare and usually has a distinct appearance and history.
Papular Urticaria: Caused by an allergic reaction to insect bites, leading to itchy papules. While not extremely rare, it's less common in the differential for facial symptoms without a clear history of bites.