A tender, red, cord-like lesion is noted on the medial aspect after chemical ablation. What is the likely diagnosis?

The scenario described—a tender, red, cord-like lesion on the medial aspect after chemical ablation—strongly indicates superficial thrombophlebitis. This condition often develops following venous procedures, including chemical ablation, which is a treatment used to close off damaged veins.

In superficial thrombophlebitis, inflammation occurs in a superficial vein, leading to pain, tenderness, and palpable cord-like structures due to the thrombosis (clot formation) within the vein. The presence of redness and tenderness aligns well with this diagnosis, particularly following a procedure that can irritate the vascular tissues.

Identifying this condition is crucial for managing post-procedural complications and ensuring proper care. The other options do not align as closely with the symptoms presented or the context of the recent chemical ablation. For instance, deep vein thrombosis typically presents with more profound symptoms, while allergic reactions would not usually cause a cord-like structure. Varicose veins represent a separate underlying condition rather than a post-procedural complication. Thus, the diagnosis of superficial thrombophlebitis is well-supported by the clinical presentation and the associated procedural context.