What causes persistent red spots on the skin following treatment?

Persistent red spots on the skin following treatment are primarily caused by vascular dilation. This condition occurs when blood vessels in the skin expand, which can lead to increased blood flow and a noticeable reddening of the tissues. This is commonly seen after procedures like electrolysis or laser treatments, as these methods can cause temporary irritation and inflammation in the skin.

The vascular response is part of the body's healing process, as the increased blood flow delivers essential nutrients and immune cells to the treated area to help repair any damage. While other factors such as infection or excessive friction might lead to skin irritation or reaction, the specific mechanism of vascular dilation is what directly results in the appearance of red spots following many types of skin treatments.

Understanding this physiological response can help practitioners manage and educate clients about what to expect after their procedures, including the importance of monitoring the skin for other signs of complications.