I had 1ml of Juvederm in my lips on Saturday. It's Tuesday and my lips are swollen and are very tight. Is this normal? (Photo)

Following dermal filler treatment, lips tend to be the area which swells the most. It isn't uncommon for the swelling to last a few days, and the tight sensation is likely attributed to this. The good news is that you have noticed the swelling coming down, and it is something I would try not to worry about. 
The degree of swelling will vary from person to person and will also be affected by the type and quantity of filler administrated. At this stage I would advise you to avoid activities which will cause the blood vessels to dilate, such as exercising or drinking alcohol, as this may delay the reduction of swelling. 
If, however, the lips were to increase in size or change in colour at this stage, it would be advisable to see your injector for a review as soon as possible. 

Hi thank you for your question.  Bruising and swelling can last up to 2 weeks.  From your description and the photo it appears to be a normal reaction to the filler.  However, if you are concerned or are experiencing any pain. It is important to follow up with your injector.