Angular Cheilitis: This condition is characterized by inflammation of the corners of the mouth, often caused by fungal infections such as Candida, which can give a yeast-like appearance. It's a common condition that can be associated with a swollen lip.

Oral Thrush: A fungal infection caused by Candida that can affect the mucous membranes of the mouth, including the lips, leading to swelling and a white, yeast-like appearance.
Impetigo: A bacterial infection that can cause red sores on the face, including the lips, and can sometimes appear with a crust or discharge that might resemble yeast.
Cold Sore (Herpes Simplex Virus): Although not typically described as having a yeast appearance, the initial stages of a cold sore can cause swelling and might be confused with other conditions.

Cellulitis: A bacterial skin infection that can cause redness, swelling, and warmth, including on the lips. It requires prompt antibiotic treatment to prevent serious complications.
Lip Cancer: Although less common, any persistent or unusual swelling of the lip should be evaluated for the possibility of cancer, especially in individuals with risk factors such as smoking or excessive sun exposure.

Sarcoidosis: A condition that can cause inflammation in various parts of the body, including the skin, and might lead to swelling of the lips. It's less common but should be considered in cases where other diagnoses are ruled out.
Melkersson-Rosenthal Syndrome: A rare neurological disorder characterized by recurrent, often unilateral, facial paralysis or weakness, swelling of the face and lips, and the development of folds and furrows in the tongue (fissured tongue). It's a rare condition but could be considered in complex or recurrent cases.