Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency care for an abdominal or groin bulge that becomes suddenly very painful, firm, or impossible to push back, especially with vomiting, a swollen abdomen, or difficulty passing stool or gas.
Darkening or marked redness of the skin over the bulge is also an emergency sign.
These symptoms can occur when tissue is trapped in a hernia.
Call emergency services for a new pulsating abdominal swelling accompanied by severe pain, weakness, or fainting.
Do not repeatedly press on it.
Arrange same-day medical care if the protuberance rapidly enlarges or becomes red, hot, and painful, particularly if you have a fever or feel unwell.
These can be signs of an infection that may need treatment.
Book a routine appointment if the area:
Routine assessment does not mean that a serious cause is expected.
The article also says
A painless lump may still deserve an examination.
Every sign above is quoted from the sofidex article on Protuberance. If you are not sure, err upward — it is always reasonable to be checked.