Laser Technician (International Board of Electrologist Certification) IBEC Board Exam

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Which term describes a round thickened patch of epidermis caused by friction?

Dermatitis
Bacili
Keratoma or Callous
Leucoderma

The correct answer is: Keratoma or Callous

The term that describes a round thickened patch of epidermis caused by friction is known as a keratoma or callous. These thickened areas of skin develop as a protective response to repetitive friction or pressure. The body responds to this ongoing irritation by producing more keratin, which is a protein that helps in forming the outer layer of skin, leading to the thickened, hardened patches. Keratomas or callouses typically appear on weight-bearing areas like the soles of the feet or hands, where consistent friction occurs. They serve as a barrier to protect underlying tissues from damage. In contrast, dermatitis refers to inflammation of the skin due to various causes, bacili are a type of bacteria, and leucoderma pertains to the loss of skin pigmentation. These terms do not align with the description of a thickened patch of skin resulting from friction, further highlighting why keratoma or callous is the correct choice in this context.