Colorado Esthetician Written Practice Exam 2026 – Complete Test Prep

The subcutaneous layer, also known as the hypodermis, is the deepest layer of the skin and is composed of loose connective tissue and a high percentage of fat. The other options given, the reticular layer, stratum basal, and stratum spinosum, are all part of the dermis layer above the subcutaneous layer. The reticular layer is primarily composed of collagen fibers, while the stratum basal and stratum spinosum are both part of the epidermis layer and do not contain significant amounts of fat. Therefore, the correct answer is the subcutaneous layer (B).