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On average, humans have around two to four million sweat glands covering the body. We sweat as a form of temperature regulation to help cool our bodies down when it gets too hot. 

How much we sweat though depends on numerous factors such as genetics, gender, age, environmental conditions, metabolism rate, weight, one's fitness level, hydration levels and the use of certain medications and drugs.

When looking at a scenario such as dehydration, when we sweat the bodily fluid is more concentrated because our bodies try to conserve water so that our organs can still function properly. So, if one is dehydrated, it seems like small crystal-like products may form on our skin or clothes. These are the salts and impurities which are removed from our body as waste products, and the process whereby this happens is similar to what the kidneys do to remove waste from our bloodstream.

A simple way of preventing or managing this scenario is by making sure that enough water is consumed on a daily basis. The average amount of water recommended by healthcare practitioners to be consumed is around 2 liters a day. If one is mildly dehydrated, or if the weather is warm to hot, then it's suggested to increase water intake to 2.5 to 3 liters on such occasions. In colder weather, it's fine to drink less water since the fluid is more conserved and sweating occurs less seldom in lower temperatures.

A good indicator to determine whether one is dehydrated or not is to look at the urine. Darker urine indicates less water in the body that's available to clear the impurities from the bloodstream, and clear to nearly colourless urine will indicate an excess of fluid.

Association with drugs

With regards to the mentioned use of illegal methamphetamine, there's no clinical evidence or research that shows that the drug can react to the water in a jacuzzi to cause crystal droplets to form in or on the skin.

What has been proven though is that the use of crystal meth can lead to the user sweating more since the drug is a stimulant that causes the body's temperature and heart rate to increase. This leads to an abnormal amount of perspiration which can cause the skin to become oily and this can result in the formation of acne.

Chronic crystal meth users, according to the National Institute on Drug Abuse, also tend to take less care of themselves and struggle with their personal hygiene. They are therefore less likely to wash or bathe their faces and are therefore more likely to develop an oily skin. In turn, this can affect the way the skin heals and its colour and texture can also change resulting in underlying issues such as the mentioned acne formation, development of cysts, and suffering from soft tissue infections and sores on the surface of the skin.

People tend to then press on these lesions and a multitude of products such as pus and sebum can be expelled. If these lesions are present for a long period of time they can end up looking a lot like crystal-like material.

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