Differential Diagnosis for a 6-year-old with a Vehicular Rash
Single most likely diagnosis
- Eczema (Atopic Dermatitis): This is the most likely diagnosis due to the itchy and blanching nature of the rash, which is consistent with eczema. The location on the inner thigh and chest is also common for eczema.
Other Likely diagnoses
- Allergic Contact Dermatitis: This is a possible diagnosis, given the itchy and blanching rash. The rash could be an allergic reaction to something that came into contact with the skin, such as a plant or an insect bite.
- Insect Bites: Insect bites, such as those from mosquitoes or fleas, can cause itchy and blanching rashes, especially on the inner thigh and chest.
- Psoriasis: Although less common in children, psoriasis can cause itchy and blanching rashes, especially on the chest and inner thigh.
Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Meningococcemia: Although rare, meningococcemia can cause a rash that is itchy and blanching, and can be life-threatening if not treated promptly. It is essential to consider this diagnosis, especially if the child has a fever or other systemic symptoms.
- Stevens-Johnson Syndrome: This is a rare but life-threatening condition that can cause a rash, especially on the chest and inner thigh. It is often associated with medication use or infection.
Rare diagnoses
- Pityriasis Rosea: This is a rare skin condition that can cause a rash, especially on the chest and inner thigh. It is often associated with a viral infection.
- Keratosis Pilaris: This is a rare skin condition that can cause a rash, especially on the inner thigh and chest. It is often associated with dry skin and can be itchy.