These glands are present in the dermis of the skin.
They have a coiled part and a tubular part which ends in an opening termed as the skin pore.
The coiled part lies in the dermis and tubular part continues from here till the outermost layer of skin (epidermis) where it opens into the sweat pore.
The coiled part is producing the sweat.
The sweat pores lie on the outer surface of the epidermis and releases the sweat out of the body.
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Final answer : Sweat glands are present in dermis.