Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Emergency care is appropriate if symptoms suggest a rapidly spreading infection, such as confusion, fainting, severe weakness, breathing difficulty, rapidly changing skin, or a marked decline in overall condition.
Follow-up plans vary according to the abscess’s depth, the procedure performed, and the person’s overall health.
A clinician may check that the wound remains open enough to drain, that pain and swelling are improving, and that there are no signs of a fistula.
Routine wound questions, mild ongoing drainage, and improving discomfort can usually be discussed during planned follow-up or by contacting the treating clinic.
The article also says
Some drainage during healing can be normal.
Contact the care team if pain or swelling is getting worse, fever develops, drainage suddenly stops while pressure increases, or there is heavy bleeding, vomiting, difficulty urinating, or inability to pass stool or gas.
Ongoing or repeated drainage from the same spot should be assessed even if it is not very painful.
It may indicate a fistula.
A new lump or return of the original pain also deserves medical review.
People with diabetes may need closer attention to blood glucose during infection and recovery.
Those taking medicines that suppress the immune system should ask the prescribing clinician whether any temporary changes are needed.
Medicines should not be stopped without medical advice.
Return to work, exercise, driving, and sexual activity depends on pain, wound location, anesthesia, and the type of work involved.
The surgical team can provide guidance based on the procedure and progress.
Every sign above is quoted from the sofidex article on Anorectal abscess. If you are not sure, err upward — it is always reasonable to be checked.