Differential Diagnosis for Non-Blanchable Perennial Rash
Single Most Likely Diagnosis
- Eczema (Atopic Dermatitis): This is the most common cause of a non-blanchable perennial rash, especially in children. The rash is often itchy, and the skin can become thickened and scaly.
Other Likely Diagnoses
- Psoriasis: Characterized by well-defined, red, scaly plaques, psoriasis can cause a non-blanchable rash, particularly on the elbows, knees, and scalp.
- Contact Dermatitis: This is a type of skin inflammation caused by contact with irritants or allergens, leading to a non-blanchable rash.
- Seborrheic Dermatitis: A common skin condition causing a non-blanchable rash, typically on the face, scalp, and torso.
Do Not Miss Diagnoses
- Meningococcemia: A life-threatening infection that can cause a non-blanchable rash (purpura), which is a medical emergency.
- Rocky Mountain Spotted Fever: A tick-borne illness that can cause a non-blanchable rash, which can be fatal if left untreated.
- Vasculitis: Inflammation of the blood vessels can cause a non-blanchable rash, which can be a sign of a serious underlying condition.
Rare Diagnoses
- Kawasaki Disease: A rare condition that mainly affects children, causing a non-blanchable rash, fever, and other symptoms.
- Stevens-Johnson Syndrome: A rare but serious disorder of the skin and mucous membranes, often caused by an adverse reaction to medication or infection.
- Erythema Multiforme: A rare skin condition characterized by a non-blanchable rash, often triggered by infections or medications.