Differential Diagnosis for Red Irritated Scalp

• Single most likely diagnosis
  • Seborrheic dermatitis: This condition is characterized by a red, itchy, and flaky scalp, which matches the symptoms described. It's a common condition that can be triggered by stress, cold weather, or certain hair products.
• Other Likely diagnoses
  • Contact dermatitis: This is a skin reaction that occurs when the scalp comes into contact with an irritant or allergen, such as a new shampoo or hair dye. It can cause redness, itching, and inflammation.
  • Psoriasis: This is a chronic skin condition that can cause red, scaly patches on the scalp. It's often accompanied by itching and flaking.
  • Eczema (atopic dermatitis): This is a condition that causes dry, itchy, and inflamed skin, which can affect the scalp. It's often seen in people with a history of allergies or asthma.
• Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
  • Meningitis: Although rare, meningitis can cause a red, irritated scalp, especially if it's accompanied by other symptoms such as fever, headache, and stiff neck. It's a life-threatening condition that requires immediate medical attention.
  • Lupus: This is an autoimmune disease that can cause a range of symptoms, including a red, irritated scalp. It's often accompanied by other symptoms such as joint pain, fever, and fatigue.
• Rare diagnoses
  • Pityriasis rubra pilaris: This is a rare skin condition that causes a red, scaly rash on the scalp, face, and body. It's often accompanied by itching and flaking.
  • Kerion: This is a rare fungal infection that causes a red, swollen, and painful scalp. It's often accompanied by fever and lymph node swelling.