It has light yellow frosting as the base color of the cake, with light blue rims at the top and bottom. Written in pastel purple, reads "Sorry about the Scabies." Next to the writing, is a pink flower imprint with darker green leaves.
Role in episode
SpongeBob buys a cake for Patrick's birthday. He then asks the baker if she could give him another cake that says "Happy Birthday," but she refuses and says it is the only cake she has available. SpongeBob purchases it anyway since he is running out of time.
Scabies is a skin disease in humans where mites burrow into the skin and cause a rash that is similar to mange in animals with fur. In this case, scabies is an STD to those in Bikini Bottom, like it would be in the human world.
According to Casey Alexander's Twitter feed, the scabies joke was based on his experience with it at the age of 10.
"I'm allowed to make the scabies joke 'cause it comes from personal experience. My 10 year old self was delighted w/ that one."