the Causes of Green Sweat: When to Seek Medical Help - Dermatology

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The color of sweat?


Hello, this evening my husband noticed that the color of the tissue he used to wipe his sweat was light green.
At first, he thought it might be due to the tissue or something green on his face, but after sweating again and using the tissue to wipe his sweat, it was still the same.
What could be the reason for this? Should we go to the hospital for an examination? Which specialty should we consult?

Xiaoru, 30~39 year old female. Ask Date: 2008/09/06

Dr. Huang Ruiyun reply Dermatology


There are two types of sweat glands: eccrine glands and apocrine glands.
The sweat produced by eccrine glands is typically colorless, and any coloration may come from pigments produced by harmless bacteria on the skin or from the absorption of certain pigments or medications.
Additionally, a small number of individuals may have colored sweat produced by apocrine glands.
If there are no other health issues, medical attention is generally not necessary.

Reply Date: 2008/09/06

More Info


When it comes to the phenomenon of green sweat, it can be quite perplexing and may raise concerns about underlying health issues. The appearance of green sweat is not common, and understanding its causes is essential for determining whether medical attention is necessary.

The color of sweat is typically clear, as it primarily consists of water and electrolytes. However, there are several factors that can lead to the discoloration of sweat, including the presence of certain pigments, medications, or even skin conditions. Here are some potential causes for green sweat:
1. Bacterial Influence: One of the most common reasons for colored sweat is the presence of certain bacteria on the skin. For instance, some bacteria can produce pigments that may mix with sweat, resulting in a greenish hue. This is particularly true for areas of the body where sweat is more concentrated, such as the armpits or groin.

2. Dietary Factors: The consumption of certain foods can also affect the color of sweat. Foods rich in chlorophyll, such as green vegetables, or those containing artificial coloring agents can lead to changes in sweat color. If your husband has recently changed his diet or consumed foods with strong pigments, this could be a contributing factor.

3. Medications and Supplements: Certain medications or supplements can cause changes in sweat color. For example, some antibiotics or medications that affect the liver can lead to unusual pigmentation in sweat. If your husband is taking any new medications or supplements, it would be wise to review them for potential side effects.

4. Skin Conditions: In some cases, skin conditions such as infections or dermatitis can lead to changes in sweat color. If there is any accompanying irritation, redness, or other symptoms, it may warrant further investigation.

5. Genetic Factors: Rare genetic conditions can also affect sweat composition, leading to unusual colors. However, these conditions are typically diagnosed early in life.

Given the unusual nature of green sweat, it is advisable to seek medical attention, especially if the discoloration persists or is accompanied by other symptoms such as itching, irritation, or changes in skin condition. A healthcare professional can conduct a thorough examination and may recommend tests to determine the underlying cause.

In terms of which medical specialty to consult, a dermatologist would be the most appropriate choice. Dermatologists specialize in skin conditions and can provide insights into whether the green sweat is a result of a skin issue, bacterial infection, or another dermatological concern.

In summary, while green sweat can be benign and related to factors such as bacteria or diet, it is essential to monitor the situation closely. If the discoloration continues or is associated with other symptoms, seeking medical advice is the best course of action. A dermatologist can help identify the cause and recommend appropriate treatment or lifestyle changes to address the issue.

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