What gland is located all over the body except in the lips and sex organs?

The eccrine gland is a type of sweat gland that is distributed widely throughout the body, playing a crucial role in thermoregulation and maintaining skin hydration. These glands are responsible for producing a clear, odorless sweat primarily composed of water and salts, which is secreted directly onto the skin's surface.

The fact that eccrine glands are found almost everywhere on the body, except in specific areas such as the lips and sex organs, highlights their ubiquity and the specialized functions they perform in maintaining homeostasis. In contrast, other glands mentioned, like apocrine glands, are found in specific areas like the underarms and groin and produce a thicker sweat that can lead to body odor when broken down by bacteria. The pituitary and thyroid glands are endocrine glands that regulate various hormonal functions in the body but do not produce sweat or have an exocrine function, which distinguishes them entirely from eccrine glands.

Thus, the recognition that the eccrine gland is the primary sweat-producing gland found throughout most of the body directly correlates with its physiological role in regulating body temperature and the unique areas where it is absent.