Black dermographism refers to the black or dark grey discoloration that occurs when the skin is touched by certain metals, most often gold. This is commonly observed when you remove a gold piece of jewelry and notice discoloration beneath where it sat. This discoloration is also referred to as black writing on the skin. Black dermographism is commonly associated with an iron deficiency. Before you draw a comparison between black dermographism and an iron deficiency, take a more in-depth look at the connection.
Black Dermographism
Black dermographism was first reported in the 1920s, and it was compared to the more well-known red and white dermographisms. Red and white dermographism, however, are caused by stimulation of nerve endings and skin tissue, such as light scratches. In contrast, black dermographism is caused by a metallic abrasion that allows small fragments of the metal to rub off onto the skin. These fragments appear to be black writing or dust.
Research
Research into black dermographism is not thorough enough to present a verified scientific explanation of the exact cause. It occurs in a large amount of the population and appears to be more common in women. According to Dr. Joseph A. Schwarcz, the alloys in metals can have a reaction with sulfur compounds of the skin, causing the black markings.
Iron Deficiency
If you suspect you have an iron deficiency, common signs other than black dermographism can help you determine if this is the case. Symptoms of an iron deficiency include weakness, headaches, dizziness, irritability, pale skin and cravings for non-food substances such as ice or dirt, according to the Mayo Clinic. If you notice these symptoms, speak with your health care professional for a further health assessment.
Black Dermographism and Iron Deficiency
There is not enough evidence to support the idea that black dermographism is linked to an iron deficiency. In addition, research does not suggest that black dermographism points to any dangerous health conditions. If you notice black dermographism after a specific change in your diet, or alongside new symptoms that could point to other health issues, consult your physician.
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