How are Obregonia and  Trichodiadema different from each other?
Trichodiadema Trichodiadema is a genus of succulent plants of the family Aizoaceae.
Trichoadenoma A trichoadenoma (also known as a "trichoadenoma of Nikolowski") is a cutaneous condition characterized by a solitary, rapidly growing skin lesion ranging from 3 to 15mm in diameter.