What do it mean when the crease of your mouth is sore?

Soreness in the crease of the mouth can have several potential causes:

Angular cheilitis: This is a common condition that causes soreness, inflammation, and cracking at the corners of the mouth. Angular cheilitis can be caused by various factors, including vitamin B deficiencies (especially vitamins B2 and B12), iron deficiency, fungal infections (such as Candida), sun exposure, ill-fitting dentures, excessive drooling, or allergic reactions.

Cold sores (Herpes labialis): Cold sores are small, painful blisters caused by the herpes simplex virus type 1 (HSV-1). They typically appear on the lips, around the mouth, or on the cheeks and can sometimes involve the crease of the mouth.

Canker sores (Aphthous ulcers): Canker sores are small, round, shallow ulcers that can form on the inside of the mouth, including the soft tissues such as the crease of the mouth. They are usually not contagious and often resolve on their own within a few weeks.

Infections: Bacterial or viral infections can cause sores and soreness in the crease of the mouth. This can occur due to local trauma, poor oral hygiene, or as a complication of a systemic infection.

Skin conditions: Certain skin conditions such as dermatitis, eczema, or allergic reactions can also cause inflammation and soreness in the crease of the mouth.

Dental problems: Poorly fitting dentures, misaligned teeth, or sharp edges on dental restorations can irritate the soft tissues in the mouth, leading to soreness and discomfort.

If you are experiencing soreness in the crease of your mouth and it persists or causes significant discomfort, it is advisable to consult a healthcare professional, such as a dentist or a doctor, for proper evaluation and treatment. They can determine the underlying cause and recommend appropriate measures to address the soreness.