Louisiana Esthetics State Board Practice Test 2026 – All-In-One Guide to Master Your Exam Success!

A furuncle, commonly known as a boil, is primarily caused by the infection of hair follicles by bacteria, particularly the cocci bacteria, which include Staphylococcus aureus. This type of bacteria is known to be a significant pathogen that can invade the skin and cause localized infections. When the hair follicle becomes infected, it leads to inflammation, pus formation, and the characteristic painful swelling associated with a furuncle.

The other options do not directly cause furuncles. Viruses can lead to different types of skin lesions or infections, but they are not responsible for boils. Fungi can cause other skin issues like ringworm or athlete's foot but are not the cause of furuncles. Allergens may trigger allergic reactions or conditions such as hives, but they do not lead to the bacterial infections that result in furuncles. Thus, identifying cocci bacteria as the cause highlights the bacterial nature of furuncles and underscores the importance of hygiene and infection control in preventing such conditions.