A 24-year-old man presented with an itchy vesicular rash on his elbows. He had a significant medical history of iron deficiency, weight loss, and diarrhea. What is the most likely diagnosis for this patient?

*This case is from the Editorial Team of Docplexus and is meant for educational purposes only. Source: Clinical Cases Uncovered-Gastroenterology (The correct answer is posted in the comment section below!)