sweat gland is located on our skin .
hope it helps.........
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is it outside the body???
two type of gland located out of our body like sweat gland ,sabacious gland.

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Exocrine glands are present in the outer surface of our body. These are  
Aprocrine glands,  Holocrine glands and Merocrine glands.  They are also known as Sweat glands, Salivery glands and mammary glands. Liver is also an Exocrine gland. 

If you are asking for the total number of them all over the surface of a human (adult) body, then it will be very large. perhaps 500,000 or even more.