What you are describing sounds typical of an abscessed tooth. After the crown was placed the nerve was probably very inflamed. That is why you had some discomfort in the begining. The fact that you are in no pain now and you have a "blister" alongside the tooth, indicated the nerve has become necrotic or has died and has cause infection. The treatment involves removing the infected nerve from tooth. This is normally done by making a small access hole through your crown to remove the nerve. This is referred to as a root canal. Once the infected nerve is removed, the inside of the tooth is sealed and the infection should subside.

Hope this helps,

Good Luck

if there is pus discharge & foul smell is cuming then, there is definite infection. get an x-ray done, localized cleaning & antibiotics can help sumtimes but if not then get the cap removed & after the infection subsides place a new crown

Hello,
Blisters on gums can occur because of gum infections, side-effects of some medicaments or can occur because of some systemic problems. Infections like cold sores also cause blisters on gums. Infected tooth can also lead to blisters on gums. Gum infection can occur because of impingement of some sharp food stuff on gums or can occur because of plaque and calculus deposits in relation to teeth. If gums infection is cause of blisters in mouth, then maintain good oral hygiene to avoid any food accumulates in relation to teeth. You can also do warm saline rinses 3-4 times a day. Dental cleaning and root planning may also be required. If there is infected tooth present which has lead to blister on gums, then treatment is done for infected tooth. If blisters are because of cold sore infection, then they will regress on its own in some time. Without examination, it is difficult to comment about definite reason of recurrence of blisters on gums in your case. You can visit your dentist for evaluation. To avoid gum blisters, it is important that you follow good oral hygiene measures. For some temporary pain relief, you can apply orajel over gum blister or can take some pain med.

Hello
Welcome to HCM
I would like to tell you that all your symptoms give a clear indication towards abscess tooth.
You need to get your cap removed followed by drainage of abscess.
Get an IOPAR done of same tooth & begin with RCT.
Once infection is removed you can get recapping done.
Also start medications after consulting your dentist.

Take Care
Regards
Dr.Neha