Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Contact a clinician promptly for increasing redness, warmth, pain, drainage, bleeding, fever, or a rapid change in size.
Sudden hearing loss should receive same-day medical assessment because early evaluation can affect treatment options.
Follow-up may be routine when a clinician has identified a small, stable, benign-appearing growth.
Keep scheduled appointments so the ear can be examined for changes.
If monitoring at home is recommended, a dated photograph may help document a visible outer-ear lesion.
Do not insert a camera, cotton swab, or other object into the ear canal.
Arrange a nonurgent appointment if a lump persists, slowly enlarges, repeatedly becomes inflamed, or begins interfering with hearing or ear devices.
The article also says
After a procedure, follow the care instructions for keeping the site clean and dry.
Attend the postoperative visit even if healing seems normal.
Ask when it is safe to swim, use earbuds, wear a hearing aid, or change earrings.
Every sign above is quoted from the sofidex article on Benign ear cyst or tumor. If you are not sure, err upward — it is always reasonable to be checked.