An allergic reaction happens when the immune system has an unusual reaction to a harmless substance. The job of immune system cells is to find foreign substances, such as viruses and bacteria, and get rid of them. Normally, this response protects us from dangerous diseases. People with skin allergies have over-sensitive immune systems. They can develop allergic rashes and other conditions due to proteins found in food, pollen, latex, drugs or other things. The skin care experts at MetroDerm can help patients determine which allergens are causing their allergic reaction and prescribe the best treatment plan.