Many times throughout the series, the characters, mainly the members of i Carly, comment and remark about Lewbert's wart, such as how "gross" or "hairy" it is.
His wart is said to be a 'stress wart' due to his ex-girlfriend, Marta, whom made him miserable when they used to date each other, according to Lewbert in i Find Lewbert's Lost Love.
He hates it when people come into his lobby, especially children and the i Carly trio.
He has a huge wart on his left cheek and a big sore on his foot that according to him, never heals.
This is a mantra that could come in handy in the dating world.