Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for severe trouble breathing, chest pain, fainting, confusion, uncontrolled bleeding, or signs of a severe allergic reaction.
Persistent swollen nodes, new skin lesions, or gradual implant changes usually call for prompt clinical review, but they are not automatically emergencies.
During or soon after cancer treatment, contact the oncology team immediately for a fever, shaking chills, unusual bleeding, inability to keep fluids down, rapidly worsening weakness, or other symptoms listed in the treatment instructions.
A fever during chemotherapy can signal an infection even if the person otherwise feels well.
Follow-up is tailored to the ALCL type and treatment received.
Routine visits may include a symptom review, physical examination, blood tests, and assessment for treatment effects.
Imaging is used when clinically appropriate rather than automatically in every situation.
After treatment for BIA-ALCL, follow-up may include clinical examinations and imaging based on the original stage and surgical findings.
People who still have a breast implant should report new swelling, a lump, firmness, pain, or a clear change in breast shape.
The article also says
People with primary cutaneous ALCL usually need ongoing skin and lymph node examinations.
New skin lesions may require evaluation or another biopsy because not every lesion has the same cause.
Every sign above is quoted from the sofidex article on Anaplastic large-cell lymphoma. If you are not sure, err upward — it is always reasonable to be checked.