Why is my right foot turning bluish/purple every time i stand? recently been diagnosed with cellulitis but doesnt look like it.

Veins: Since veins in the legs fill with blood more on standing, it is not unusual to see slight such color change and this clears with elevation of the legs. Perhaps the vein valves in the right leg are weaker than on the left accounting for the difference. As long as there is no leg pain or swelling and the color improves on elevating the leg, it appears that there is no serious problem with your foot.

Need much more detai: You left out all the details. What was the evidence that it was cellulitis rather than phlebitis? How have you been treated? Most diagnoses of cellulitis, especially the leg, are wrong when not by dermatologists.