If necessary, a veterinarian can examine the animal.
What Should Parents Do Now?
Because the rash shown has reportedly persisted for around two months and is getting worse, the safest approach is to arrange an examination with a pediatrician, family doctor, or dermatologist.
A clinician may be able to diagnose the condition simply by examining the skin.
If fungal infection is suspected, they may use a skin scraping or another test to look for fungal elements.
Treatment can then be selected based on the actual diagnosis.
Until the cause is known, avoid sharing:
Towels
Clothing
Bedding
Hairbrushes
Personal grooming items
with other family members if a contagious infection is suspected.
Wash clothing and bedding regularly and encourage the child to avoid scratching the affected areas.
When Should a Child Be Seen More Urgently?
A persistent rash doesn't necessarily represent an emergency.
However, medical attention should be sought promptly if the child develops:
Fever
Rapidly spreading redness
Severe pain
Significant swelling
Pus or drainage
Blistering
Open sores
Red streaks spreading from the affected area
Facial or eye involvement
Signs of a serious allergic reaction
A rash accompanied by difficulty breathing, swelling of the lips or tongue, or severe illness requires emergency medical attention.
The Bottom Line
The circular marks in this photograph could have several possible explanations, and it isn't possible to diagnose the condition reliably from the image alone.
One important possibility is ringworm (tinea corporis), particularly if the patches are expanding, itchy, or scaly around the edges. Other possibilities include granuloma annulare, eczema, contact dermatitis, and other inflammatory skin conditions.
Because the marks have reportedly been present for two months and are getting worse, this isn't something a parent should simply continue watching indefinitely.
A healthcare professional can examine the lesions and, if necessary, perform a simple test to determine whether fungus is involved.
Most importantly, don't panic and don't assume the worst.
A persistent childhood rash deserves attention, but many of the conditions that cause circular skin lesions are treatable once the correct cause has been identified.
If your child has a rash that keeps growing, changing, or returning, getting the right diagnosis is far more useful than trying random creams at home.