What causes a feeling of being cut under the skin?

A feeling of being cut under the skin can be caused by several factors, including nerve irritation, muscle strain, or skin conditions such as dermatitis. It may also result from conditions like fibromyalgia or neuropathy, where the nerves send abnormal signals. In some cases, this sensation could be psychosomatic, where emotional stress manifests as physical discomfort. If persistent or severe, it's advisable to consult a healthcare professional for an accurate diagnosis.