Sometimes, the affected veins, where the clot forms, become visible at the surface of the skin. With the inflammation of the skin, many surface nerves may become more prominent and visible, with the affected deep vein being the most conspicuous. The latter may also be felt on the skin surface as a firm thickened cord. This presence reflects that the vein membranes are stressed due to impediment in blood flow, causing the vein to assume such a rigid form, that you can quickly feel it by prodding the epidermis. When symptoms become this severe, you should not hesitate to consult a doctor.

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