The most noticeable sign of superficial phlebitis is a series of hard, painful lumps underneath the skin. There may be a red streak on the skin’s surface, accompanied by swelling and tenderness in the area, or the skin over the vein may turn dark. The red, itchy patch may feel warm and tender, and the individual may have a low-grade fever. Superficial phlebitis can also occur around the site of an irritating IV.

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