lumps form wen the water is hot and cold wat u need to do is put the paste or flower in first then pour u'r water while stiring and keep on stiring if that doesn't work or if this is not wat u mean...
An indication of infection - quite possibly the start of an abscess - needs checking out because it can become very painful and untreated the infection can spread to your blood.
Oh, you should get to a dentist right away; I don't think it would be over-reacting to consider it urgent. You may have an abscess, which could become a serious problem left untreated.