Differential Diagnosis for Truncal Rash
- Single most likely diagnosis
- Eczema (atopic dermatitis): This is a common condition that often presents with a truncal rash, characterized by itchy, inflamed skin. The rash can be acute or chronic and is often seen in individuals with a history of allergies or asthma.
- Other Likely diagnoses
- Psoriasis: A chronic skin condition that can cause a truncal rash, typically appearing as red, scaly patches. It can be associated with other symptoms like joint pain.
- Contact dermatitis: This occurs when the skin comes into contact with an irritant or allergen, leading to a rash. The truncal area can be affected if the individual has come into contact with such substances on their torso.
- Tinea corporis (ringworm): A fungal infection that can cause a rash on the trunk, characterized by ring-shaped lesions.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Meningococcemia: Although rare, this condition can present with a rash and is life-threatening. It's caused by a bacterial infection that can lead to meningitis or sepsis.
- Rocky Mountain spotted fever: A tick-borne illness that can cause a rash, fever, and headache. It's critical to diagnose early as it can be fatal if not treated promptly.
- Lyme disease: Another tick-borne illness that can cause a rash (often a "bull's-eye" rash), fever, and other symptoms. Early diagnosis and treatment are crucial to prevent long-term complications.
- Rare diagnoses
- Pityriasis rubra pilaris: A rare skin disorder that can cause a truncal rash, characterized by small, pointed bumps and reddish-orange patches.
- Keratosis pilaris: A condition that causes small, rough patches on the skin, which can sometimes appear on the trunk.
- Sarcoidosis: A disease that can affect multiple parts of the body, including the skin, and cause a truncal rash among other symptoms.