Differential Diagnosis

• Single most likely diagnosis:
  • Eczema (atopic dermatitis): This is likely due to the presence of a rash with erythema, edema, and possible excoriations, which are common features of eczema.
• Other Likely diagnoses:
  • Contact dermatitis: This could be a possible diagnosis if the rash is localized to a specific area and has been exposed to an irritant or allergen.
  • Psoriasis: Although less likely, psoriasis could be considered if the rash has a silvery scale and well-defined borders.
  • Seborrheic dermatitis: This could be a possible diagnosis if the rash is located on the scalp, face, or torso, and has a greasy, yellowish scale.
• Do Not Miss (ddxs that may not be likely, but would be deadly if missed.):
  • Cellulitis: Although less likely, cellulitis is a serious infection that requires prompt treatment, and its presentation can sometimes be similar to that of a rash.
  • Erythema multiforme: This is a rare but serious condition that can be life-threatening if not recognized and treated promptly.
  • Stevens-Johnson syndrome: This is a rare but serious condition that can be life-threatening if not recognized and treated promptly.
• Rare diagnoses:
  • Pityriasis rubra pilaris: This is a rare skin disorder characterized by a reddish-orange rash and keratotic follicular papules.
  • Cutaneous T-cell lymphoma: This is a rare type of cancer that can present with a rash, and its diagnosis requires a skin biopsy.