Final answer:
The patient is likely deficient in vitamin B12, which can cause angular cheilitis, glossitis, stomatitis, and normocytic anemia. Seborrheic dermatitis is another symptom associated with vitamin B12 deficiency.
Step-by-step explanation:
The patient with angular cheilitis, glossitis, stomatitis, and normocytic anemia, seborrheic dermatitis is likely deficient in vitamin B12.
Vitamin B12 deficiency can result in these symptoms and conditions. Angular cheilitis is characterized by redness, cracking, and swelling at the corners of the mouth. Glossitis is inflammation of the tongue, causing it to become swollen and smooth. Stomatitis is inflammation of the mouth and lips, resulting in painful sores. Normocytic anemia refers to a type of anemia where the red blood cells are normal in size but insufficient in number. Seborrheic dermatitis is a type of inflammatory skin condition primarily affecting areas with high sebaceous gland activity.