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 care is appropriate for symptoms such as confusion, fainting, severe weakness, or difficulty breathing.
And for anyone, someone who:
Arrange a clinical review sooner for a widespread rash, significant pain, repeated infections, nail changes, or a rash in a person with diabetes or reduced immune function.
Seek urgent medical care for rapidly spreading redness, worsening swelling, severe pain, fever, pus, red streaks, or a person who appears acutely unwell.
And for anyone, someone who:
For a small and otherwise mild rash, routine follow-up is appropriate if symptoms do not begin to improve with correctly used treatment, if they return soon after treatment, or if the diagnosis remains uncertain.
At follow-up, a clinician may confirm whether the infection has cleared, reconsider the diagnosis, review how treatment was used, or test for another fungal or bacterial condition.
Recurrent cases may require a plan for moisture control and evaluation of contributing health factors.
And for anyone, someone who:
The article also says
An infant should be assessed if a diaper rash is severe, blistering, draining, associated with fever, or not improving with usual care.
A clinician can check for Candida and other causes of diaper-area inflammation.
Every sign above is quoted from the sofidex article on Candida infection of the skin. If you are not sure, err upward — it is always reasonable to be checked.