Final answer:
Hypopigmentation is characterized by lighter areas of skin and does not use the terms superficial, deep, moderate, or severe for its severity. Hyperpigmentation, as seen in Addison's disease, is more closely related to these terms. Chromosomal mutation is unrelated to hypopigmentation severity.
Step-by-step explanation:
The question about the level of response of hypopigmentation in dermatological terms does not align with the provided information. Hypopigmentation refers to areas of the skin that are lighter than the surrounding skin, which can occur for various reasons, including genetic conditions but is not categorized using the terms superficial, deep, moderate, or severe. Instead, these terms could describe the level of skin damage or pigmentation issues. For example, Addison's disease can cause hyperpigmentation, where the skin darkens. Hypopigmentation can indeed be reduced by limiting exposure to the sun, but it does not typically result from poor hygiene, nor is it limited to only the epidermis.
Regarding the chromosomal mutation, this term refers to a change in the structure or number of chromosomes, which can result in genetic disorders or diseases. It is unrelated to the severity of hypopigmentation.