Rashes are very common and rarely need medical attention, particularly where there is no fever. Many are viral or allergic in origin and will settle within a short period of time. Rashes often occur after a feverish or viral illness and often represent the final stage of an illness. Many rashes respond well to antihistamin tablets and / or hydrocortisone 1% cream, both available over the counter. Some rashes, i.e. chickenpox, require you to isolate your child for up to 5 days and some rashes e.g. measles require a notification. If your child has not had the MMR vaccine (and booster) contact your surgery now. For meningitis rashes  see:

For a rash in a patient otherwise well, but which is getting worse or not improving with simple measures: Contact GP.