Why do you have bloody cracks at the edge of my mouth?

Cracks at the edge of the mouth, also known as angular cheilitis, can be caused by various factors. Here are some possible reasons:

1. Nutritional Deficiencies: Certain nutrient deficiencies, particularly a lack of vitamins B2 (riboflavin), B3 (niacin), B6 (pyridoxine), B12, or iron, can manifest as angular cheilitis.

2. Iron Deficiency: Iron deficiency anemia, which is especially prevalent in menstruating women, pregnant individuals, and certain medical populations, can be associated with angular cheilitis.

3. Zinc Deficiency: Zinc plays a vital role in skin integrity, and zinc deficiency can lead to angular cheilitis.

4. Vitamin B Deficiency: Other vitamins important for skin health that can cause angular cheilitis if they're deficient are B2 (riboflavin), B12, and vitamin B3 (niacin).

5. Dryness: Environmental factors like excessive dryness or constant lip licking can cause cracks at the corners of the mouth.

6. Oral Hygiene: Poor oral hygiene, including prolonged contact with saliva, can cause the corners of the mouth to break down and become susceptible to infection.

7. Skin Conditions: Some skin conditions, such as eczema, psoriasis, and dermatitis, may extend to the corners of the mouth, causing cracking.

8. Infection: Angular cheilitis can sometimes be caused by infections, commonly due to bacteria (e.g., Staphylococcus or Streptococcus) or yeast (Candida).

9. Dental Problems: Certain dental issues, such as ill-fitting dentures, misaligned teeth, or excessive mouth breathing, can contribute to angular cheilitis.

10. Allergic Reactions: In rare cases, allergic reactions to dental materials or certain foods (such as gluten) can cause angular cheilitis.

If you notice bloody cracks at the edge of your mouth and the affected area is itchy, swollen, or painful, it's recommended to consult a healthcare provider or a dermatologist to determine the underlying cause and receive appropriate treatment.