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 symptoms should not wait for routine follow-up.
Call emergency services for throat or tongue swelling, severe breathing difficulty, fainting, confusion, or rapidly worsening symptoms affecting more than one body system.
Arrange a prompt appointment if the rash begins lasting longer than usual, leaves bruises, occurs without warming or sweating, or is accompanied by new breathing or digestive symptoms.
A specialist review is reasonable when the diagnosis is uncertain, sweating appears reduced, or standard treatment has not helped.
Routine follow-up is appropriate when episodes are recurring, limiting activity, disturbing sleep, or not controlled by the current plan.
Follow-up also allows a clinician to check medicine effectiveness, side effects, and whether the pattern still fits cholinergic urticaria.
The article also says
Keep a brief symptom record before appointments.
Note the trigger, timing, rash location, duration, associated symptoms, and what helped.
Bring photographs and a list of all medicines and supplements.
Every sign above is quoted from the sofidex article on Cholinergic type physical urticaria. If you are not sure, err upward — it is always reasonable to be checked.