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 assessment is also appropriate if a serious infection is suspected or pain prevents safe movement and cannot be controlled.
Seek prompt medical advice if an open blister develops increasing redness, warmth, swelling, pus, a bad smell, or worsening pain.
These can be signs of infection and may need treatment.
Get urgent medical help if redness is spreading quickly, especially with fever, chills, marked drowsiness, confusion, or feeling seriously unwell.
A new widespread blistering episode, blisters in the mouth or eyes, or breathing or swallowing problems is not typical of localized EBS and needs urgent assessment.
Arrange a routine appointment if blisters are recurring without a confirmed diagnosis, are becoming more frequent, or interfere with walking, sleep, school, work, or normal activity.
Review is also appropriate for ongoing pain, thickened skin, nail changes, or sweating that is difficult to manage.
Every sign above is quoted from the sofidex article on Localized epidermolysis bullosa. If you are not sure, err upward — it is always reasonable to be checked.