I was desperately looking for cellulitis. I never did see it. Some say I'm still looking for it to this day.
Lymphangitis is an infection of lymph vessels, while being a complication of some bacterial infections.
-Key words in vignette is "red streak extending to elbow".
Look at this picture: https://www.jpeds.com/article/S0022-3476(13)00037-1/fulltext.
The form is made because the streak follows the shape of the lymph node. Very noticeable once you see the image.
-Superficial thromphlebitis can't be the answer because it is generally caused by clotting in woman over 40 or 6 months post partum.
Remember the question asks "most likely" but many of some of these choices can definitely be in the differential diagnosis.