Spontaneous resorption might occur. If not, the abcess usually softens and tends to open spontaneously. In such instances, a scar may form. The abcess heals within a few weeks. Regional adenopathies may appear 2 or 3 months after BCG vaccination, especially in infants.
Resorption is spontaneous in most cases.
Occasionally, the procedure must be repeated. No other treatment is necessary and healing is spontaneous. Exceptionally, such nodules may reappear more than twice. Surgical excision may then be indicated. It is desirable that all reactions, occurring immediately or shortly after vaccination, be reported to the manufacturer of the product and to the provincial epidemiologist.