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 confusion, fainting, severe weakness, difficulty breathing, very fast breathing, mottled skin, or rapidly spreading redness with serious illness.
These may indicate sepsis or another emergency.
Arrange prompt medical assessment for persistent discoloration, a blister over a pressure point, broken skin, or a wound that is becoming deeper.
Also seek assessment if a medical device leaves a lasting mark.
Seek urgent medical help if an ulcer develops increasing warmth, swelling, redness, pain, pus, bad-smelling drainage, black tissue, or rapidly worsening skin changes.
Fever or feeling newly unwell with a wound also requires urgent assessment.
Continue routine follow-up even when the wound appears to improve.
Follow-up allows clinicians to measure healing, review dressings, check pressure-relief equipment, and adjust the care plan.
Every sign above is quoted from the sofidex article on Decubitis ulcers. If you are not sure, err upward — it is always reasonable to be checked.