Even after extraction, an abscess can reappear if there is residual infection, retained root fragment, or chronic infection in the bone or soft tissue.
Since a space maintainer was recently adjusted, local irritation or trapped food/plaque can also contribute
Next Steps
1)Get an IOPA / OPG X-ray to rule out any remaining root piece or bone infection
2)Check the fit and hygiene around the space maintainer
3)If abscess is present, drainage + antibiotics may be required
4)Referral to a pedodontist is advised for proper evaluation and management