Differential Diagnosis for Bright Red Erythematous Rash on Trunk and Upper Thighs
- Single Most Likely Diagnosis
- Contact Dermatitis: This is a common condition that can cause a bright red erythematous rash, especially if the patient has come into contact with an allergen or irritant. The rash is often itchy and can appear on any part of the body, including the trunk and upper thighs.
- Other Likely Diagnoses
- Eczema (Atopic Dermatitis): A chronic skin condition characterized by itchy, inflamed skin, which can appear as a bright red erythematous rash on the trunk and upper thighs.
- Psoriasis: An autoimmune condition that can cause red, scaly patches on the skin, including the trunk and upper thighs.
- Allergic Reaction: An allergic reaction to a medication, food, or other substance can cause a bright red erythematous rash on the trunk and upper thighs.
- Do Not Miss Diagnoses
- Toxic Epidermal Necrolysis (TEN): A life-threatening condition that can cause a bright red erythematous rash, often accompanied by blistering and peeling of the skin. It is usually caused by a medication reaction.
- Stevens-Johnson Syndrome: A rare but serious condition that can cause a bright red erythematous rash, often accompanied by blistering and peeling of the skin, as well as mucous membrane involvement.
- Septicemia: A bacterial infection that can cause a bright red erythematous rash, often accompanied by fever, chills, and other systemic symptoms.
- Rare Diagnoses
- Erythema Multiforme: A rare skin condition that can cause a bright red erythematous rash, often accompanied by target-shaped lesions.
- Kawasaki Disease: A rare condition that can cause a bright red erythematous rash, often accompanied by fever, lymphadenopathy, and other systemic symptoms.
- Sweet Syndrome: A rare condition that can cause a bright red erythematous rash, often accompanied by fever, neutrophilia, and other systemic symptoms.