Nose tip turned blue 3 hours after my last nonsurgical rhinoplasty 11 months ago. Could this have been an infection? (photos)

Temporary gel fillers like HA are associated with a low risk of infection, since HA is a sugar, and vascular occlusion, since it's a large particle gel. Your photo appears to show redness that could be consistent with infection. Vascular compromise may lead to necrosis. It's impossible to answer this question with certainty based on your photos alone. Hope this helps. Dr Joseph

Infection versus vascular occlusion: it was almost certainly not an infection. Infections take much longer to develop. It looks like a partial vascular occlusion which fortunately did not progress to the point of skin necrosis but resolved. It is a very scary experience and you were right to panic. That is one of the risks of injecting filler to the nose.