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Why is cortisone such as Cortoderm contraindicated for people suffering from cold sores?

Cortisone, such as Cortoderm, is not recommended for people suffering from cold sores because it has immunosuppressive effects. This means it can reduce inflammation by suppressing the immune system's local action. In the case of eczema, this effect is desired as it is an inflammatory condition. However, in the case of an infection like cold sores, using cortisone cream could potentially delay healing.