Viral Exanthem: This is the most common cause of rashes in children, often accompanied by fever and upper respiratory symptoms. Justification: The age of the patient and the commonality of viral infections in this demographic make viral exanthem a likely diagnosis.

Eczema (Atopic Dermatitis): A chronic condition characterized by itchy, inflamed skin. Justification: Eczema is prevalent in children and can be triggered by various factors, including allergies and environmental irritants.
Allergic Contact Dermatitis: A skin reaction that occurs after contact with an allergen or irritant. Justification: Children are often exposed to new substances that can cause allergic reactions, making this a plausible diagnosis.
Impetigo: A highly contagious bacterial skin infection. Justification: Impetigo is common in children, especially in areas where skin-to-skin contact is frequent, such as daycare settings.

Meningococcemia: A severe infection caused by Neisseria meningitidis, which can present with a rash. Justification: Although rare, meningococcemia is life-threatening and requires immediate medical attention, making it crucial not to miss this diagnosis.
Kawasaki Disease: An acute febrile illness that can cause a rash, among other symptoms. Justification: Kawasaki disease can lead to serious cardiac complications if not treated promptly, emphasizing the importance of considering this diagnosis.
Stevens-Johnson Syndrome: A severe skin and mucous membrane disorder, often drug-induced. Justification: This condition is medical emergency that can be fatal if not recognized and treated promptly.

Juvenile Idiopathic Arthritis (JIA): A chronic autoimmune disease that can cause skin rashes. Justification: While JIA is less common, it's essential to consider it in the differential diagnosis, especially if the rash is accompanied by joint symptoms.
Lyme Disease: A bacterial infection transmitted by ticks, which can cause a distinctive rash. Justification: Although less common in urban areas, Lyme disease should be considered, especially if the child has been in areas where ticks are prevalent.