This is another reason not to assume that every persistent rash is caused by fungus.

Treatment for eczema is different from treatment for a fungal infection, and using the wrong medication can sometimes make a fungal rash more difficult to recognize.

5. Why You Should Be Careful With Steroid Creams

One common mistake parents can make is applying a steroid cream to an unidentified circular rash.

Steroid creams can reduce redness and itching caused by inflammation.

But if the underlying problem is actually a fungal infection, steroids can sometimes change its appearance while allowing the fungus to continue growing.

This can produce what's sometimes called tinea incognito, in which the fungal infection becomes less typical in appearance because of steroid exposure.

That can make diagnosis more difficult.

For this reason, parents should avoid repeatedly treating an unexplained rash with prescription or potent steroid creams unless a healthcare professional has recommended them.

Could It Be Something More Serious?

Most childhood rashes are caused by relatively common skin conditions.

Nevertheless, persistent or worsening skin changes deserve appropriate evaluation.

A doctor may want to know:

• When the rash first appeared
• Whether it is itchy
• Whether it is painful
• Whether it has increased in size
• Whether new lesions have appeared
• Whether the child has fever
• Whether anyone else in the household has a similar rash
• Whether the child has contact with pets
• Whether new soaps, detergents, or skin products were introduced

These details can help narrow down the possibilities.

Don't Forget About Pets

If a fungal infection is suspected, household animals can sometimes be relevant.

Cats and dogs can carry certain dermatophytes and may occasionally transmit them to humans.