Frown lines form when facial expressions are made as the muscle under the skin contracts. Over time, as your skin ages, these repeated expressions cause lasting frown lines. Neurotoxins, such as XEOMIN®, are prescription medications that block the release of chemicals that cause these muscle contractions. So frown lines are softened. Above picture was before treatment, and then 7 days after treatment. This is NOT a Begin with Skin Med Spa client.