What type of glands are coiled structures found in the underarm and genital areas?

Apocrine glands are indeed the type of glands that are coiled structures found specifically in the underarm and genital areas. These glands are a type of sweat gland that becomes active during puberty and are associated with hair follicles in these regions. The secretion from apocrine glands is thicker and milky compared to the watery secretion produced by eccrine glands, another type of sweat gland. The contents of apocrine glands can also contribute to body odor when they are broken down by bacteria on the skin's surface.

Eccrine glands, on the other hand, are distributed widely across the body, primarily located on the palms, soles, and forehead, and are mainly responsible for thermoregulation through the secretion of a watery, odorless sweat. Sebaceous glands are associated with hair follicles and produce sebum, an oily substance that helps to keep the skin moisturized and can contribute to acne when overactive. Exocrine glands is a broader classification that includes all glands that secrete substances onto epithelial surfaces, either directly or through ducts, and is not specific enough to answer the question.