Islamic Interpretation of Dreams (Ibn-i Sirin):

Swelling in a dream means increase in one’s earnings, or earnings that will be quickly spent, or it could mean increase in one’s knowledge.

Swelling in a dream also signifies pride, self-adulation, or a hidden claim.

If a swelling from inflammation subsides in a dream, it means the return of a traveller, calming the fury of an angry person, controlling the exasperation of an outraged person, things returning to normal, appeasement of a repulsive person, or loss of one’s job.

(Also see Pimple)