Final answer:
A steatoma most often appears on the scalp, neck, and back. These areas have a higher concentration of sebaceous glands and are more exposed to sun, affecting the epidermis.
Step-by-step explanation:
A steatoma, or sebaceous cyst, is commonly found on the scalp, neck, and back. These areas are more prone to such cysts due to a higher concentration of sebaceous glands and may also be related to more frequent sun exposure, which affects the stratum basale of the epidermis. It is important to note that other skin conditions, such as basal cell carcinoma, also frequently appear on the head, neck, arms, and back. Basal cell carcinoma and squamous cell carcinoma, which commonly affect the scalp, ears, and hands, are skin cancers that arise from the epidermal cells and may require treatments like surgery or radiation. Conditions affecting the skin, like psoriasis, often present with itchy or sore patches and can appear on various parts of the body such as the elbows, knees, scalp, back, and face.