What type of bacteria are arranged in clusters resembling a bunch of grapes and can cause abscesses and pustules?

The correct answer refers to a specific type of bacteria known as staphylococci, which are characterized by their arrangement in clusters that resemble a bunch of grapes. These bacteria are typically spherical in shape and can lead to various infections, including abscesses and pustules. Staphylococci are notorious for their ability to cause skin infections, as well as more serious conditions such as pneumonia, endocarditis, and bloodstream infections.

Understanding the characteristics of different bacteria is essential in cosmetology, as practitioners may frequently encounter skin conditions that require an understanding of the underlying causes. The other bacterial arrangements listed—streptococci (which form chains), diplococci (which appear in pairs), bacilli (rod-shaped), and spirilla (spiral-shaped)—do not match the cluster formation of staphylococci and thus are not linked to the same types of infections. This knowledge helps in recognizing and responding to potential infections in clients' skin and scalp during treatments.