I have 0.5ml injected in September and an added 1ml in October, up until last month i have been 100% happy with the results. I have had small lumps form at 3 or 4 or the injection points. Also, this week i have been unwell, just a common cold, but my lips have swollen so much and the filler seems to be harder than ever, it causes slight pain when pressure is applied. Is this due to an infection, the cold or just a side effect of the filler?