Pigmentary mosaicism is a term used to encompass all of these different types of pigmentary patterns. Among these mosaic patterns, there have been only a few reports of the phylloid presentation in the literature. On the other hand, autoimmune disorders can be associated with neurocutaneous markers and syndromes. A fifteen-year-old girl was presented for chronic diarrhea and abdominal pain. Her physical examination had determined multiple hypopigmented patches. Finally, she was diagnosed phylloid hypomelanosis together with partial trisomy 13 accompanying celiac disease and autoimmune thyroiditis.