Rosacea: This is a common condition characterized by redness, inflammation, and sometimes acne-like lesions on the face, particularly on the nose, cheeks, and forehead. The symptoms can be exacerbated by sun exposure, stress, and certain foods.

Contact Dermatitis: An allergic or irritant reaction to substances like makeup, sunscreen, or glasses frames can cause redness and pain on the bridge of the nose.
Acne: Pimples or cysts on the nose can cause redness and pain, especially if they become inflamed or infected.
Sunburn: Prolonged sun exposure without adequate protection can lead to sunburn, causing redness and pain on the bridge of the nose.
Nasal Furuncle or Carbuncle: A bacterial infection of the hair follicles on the nose can cause a painful, red lump.

Cellulitis: A bacterial infection of the skin and subcutaneous tissues that can spread rapidly and become serious if not treated promptly.
Erysipelas: A type of bacterial infection that affects the upper layer of the skin, characterized by redness, swelling, and pain, often accompanied by fever and malaise.
Lupus: Systemic lupus erythematosus (SLE) can cause a butterfly-shaped rash across the nose and cheeks, which may be accompanied by other systemic symptoms.

Sarcoidosis: A condition characterized by the growth of granulomas (inflammatory cells) in various parts of the body, including the skin, which can cause redness and pain on the nose.
Granuloma Faciale: A rare skin condition that causes reddish-brown plaques or nodules on the face, particularly on the nose, due to inflammation of the blood vessels.
Wegener's Granulomatosis (Granulomatosis with Polyangiitis): A rare autoimmune disorder that can cause inflammation of the blood vessels, leading to symptoms such as redness and pain on the nose, as well as other systemic symptoms.