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 if you have widespread red or discoloured skin with severe illness, breathing difficulty, fainting, confusion, or signs of a severe allergic reaction.
These are not features of an ordinary plaque psoriasis flare.
Request a prompt assessment for new joint pain, swelling, morning stiffness, heel pain, or a whole swollen finger or toe.
These symptoms do not always mean psoriatic arthritis, but they should not be ignored.
Seek urgent same-day medical help if psoriasis rapidly spreads, becomes intensely painful, or develops widespread pustules.
Fever, chills, weakness, dehydration, or feeling seriously unwell alongside a major skin flare also need urgent assessment.
Arrange a routine appointment if you have persistent scaly skin patches, unexplained nail changes, or symptoms that are not improving with your current plan.
A review is also appropriate when treatment is difficult to use, causes side effects, or no longer controls your psoriasis.
Every sign above is quoted from the sofidex article on Psoriasis. If you are not sure, err upward — it is always reasonable to be checked.