Pustules on teeth, usually root inflammation, that is, periapical periodontitis, are caused by nerve necrosis or incomplete dental treatment, and inflammatory substances are eliminated along the root tips. Generally, if the bone on the lip side or the rest side is thinner, pustules will grow from the side of teeth, that is, fistulas.

Guidance:

According to your situation, root inflammation is also chronic periapical periodontitis. I don't know the reason why you inserted porcelain teeth at the beginning. If the abutment teeth are thinner, There may be nerve necrosis, or it may be caused by the incomplete treatment of the teeth, or it may be caused by excessive preparation of teeth. Generally speaking, there is nothing wrong with abutment teeth, so it is rarely caused by porcelain teeth. I suggest you go to the hospital to take a film and have a thorough root canal treatment, and you will be fine.

The doctor asked:

How long has your porcelain teeth been inserted? Is it because the tooth is missing or the tooth is bad?