Is this localized red rash a symptom of lipo from 3 months ago? (photos)

Yesterday I began experiencing intense itching on my lower back, like it’s itching underneith the skin. I didn’t attempt to itch it too much because the skin there is still pretty numb, but I did squeeze it a bit for relief. Eventually I pulled over at a visitor center and found that the area was very swollen. I used a salt, lemongrass scrub to rub over the affected area and it immediately turned bright red and mottled (the first two pictures). This morning it appears less swollen but more red.