Why is it Called “Coin-shaped Eczema”?
Coin-shaped eczema, also known as discoid eczema, is a type of eczema that often occurs in the winter. The name comes from the appearance of the symptoms, which present as round, coin-sized shapes on the skin. It has nothing to do with coins themselves, so don’t mistakenly think it’s caused by contact with dirty coins or metals leading to eczema.
Where Does Coin-shaped Eczema Typically Appear?
Unlike atopic dermatitis, which is a type of eczema affecting the whole body, coin-shaped eczema usually only appears on specific parts of the body. It most commonly occurs on the lower legs, followed by the thighs, and only a few patients experience it on their arms, torso, and other parts.
What Causes Coin-shaped Eczema and What Are the Symptoms?
The exact cause of coin-shaped eczema is still unknown, but it is believed to be closely related to allergic constitutions and xerotic eczema (commonly known as winter itch).
Causes of Coin-shaped Eczema
Based on cases in Taiwan, the following are several factors that may cause coin-shaped eczema:
Allergic reactions to specific types of bacteria. For instance, some people may be allergic to Staphylococcus aureus. Dry skin on the legs. Minor wounds from mosquito bites can turn into eczema after being scratched. Research shows that allergies to metals, especially nickel, may also be a cause. Minor wounds from mosquito bites can turn into eczema after being scratched.
Symptoms of Coin-shaped Eczema
The symptoms of coin-shaped eczema can appear singly or several at once, forming large areas of red, swollen skin. Initially, the affected areas may be as small as a bean, then gradually spread to the size of a one or ten-dollar coin, sometimes even forming blisters and peeling. However, the most troublesome symptom for most patients is the intense itching, which makes it hard to resist scratching. If not careful, scratching can break the skin and potentially lead to bacterial infection.
Is Coin-shaped Eczema Difficult to Cure?
Acute cases of coin-shaped eczema on the lower limbs mostly heal within two weeks; while systemic treatments may take several weeks to 2 months for the skin darkened by pigment deposition to gradually return to normal. However, patients are prone to relapse during the winter, with relapse reasons related to allergic constitution, dry climate, and psychological stress.
How to Prevent Coin-shaped Eczema?
Although the exact cause of coin-shaped eczema is not fully understood, preventing common exacerbating factors can help control the condition. Any visible or invisible small wound can lead to new coin-shaped eczema, so it’s important to protect your skin. If your hands are prone to eczema, remember to wear gloves or use alternative tools to avoid chemical irritants.
Regular moisturizing treatments are crucial; apply a moisturizing lotion or Vaseline after bathing. Avoid being bitten by insects in the environment. If you feel itchy, it’s best to seek medical advice promptly and apply the appropriate amount of ointment to prevent scratching from turning a “one-dollar” spot into a “ten-dollar” large area.
Patients with coin-shaped eczema often also experience dry skin, especially in winter when environmental humidity drops, causing the skin to dry out further. Therefore, patients should avoid hot water showers, frequently use moisturizing lotions to maintain moisture; avoiding excessive emotional stress can also prevent eczema from knocking on the door or worsening.
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