Differential Diagnosis for Itchy Bumps in a 4-Year-Old Toddler's Underarm
- Single Most Likely Diagnosis
- Eczema (Atopic Dermatitis): This is a common condition in toddlers, characterized by itchy, inflamed skin. The underarm area is a typical location for eczema due to moisture and friction.
- Other Likely Diagnoses
- Contact Dermatitis: This could be due to an allergic reaction or irritation from soaps, detergents, or other substances that come into contact with the underarm skin.
- Heat Rash (Miliaria): Toddlers can easily overheat, especially in warm environments, leading to blocked sweat ducts and itchy bumps.
- Insect Bites: Mosquitoes, fleas, or other insects might bite the underarm area, causing itchy bumps.
- Do Not Miss Diagnoses
- Scabies: Although less common, scabies is highly contagious and can cause severe itching, especially at night. It's crucial to consider this diagnosis to prevent outbreaks.
- Impetigo: A bacterial skin infection that can cause itchy, red sores and must be treated with antibiotics to prevent spread and complications.
- Rare Diagnoses
- Kawasaki Disease: A rare condition that can cause skin rashes, including in the underarm area, along with fever, swollen lymph nodes, and other symptoms. It requires prompt medical attention.
- Lymphoma: Extremely rare in toddlers, but any persistent, unexplained skin lesions or symptoms should be thoroughly investigated to rule out serious conditions like lymphoma.