Differential Diagnosis for Red Scaly Plaque on Hairline Scalp
- Single most likely diagnosis
- Seborrheic dermatitis: This condition is characterized by a red, scaly, and itchy rash, often found on oily areas of the body such as the scalp, particularly around the hairline. It's a common condition that matches the described symptoms.
- Other Likely diagnoses
- Psoriasis: This chronic skin condition can cause red, scaly patches on the scalp, including the hairline. It's known for its silvery scales and can be itchy.
- Contact dermatitis: An allergic reaction or irritation from hair products can lead to a red, scaly rash on the scalp, especially around the hairline.
- Dandruff: A mild form of seborrheic dermatitis, dandruff causes flakes of skin to appear on the scalp, often accompanied by redness and itching.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Lupus: Systemic lupus erythematosus can cause a red, scaly rash on the scalp, among other symptoms. It's an autoimmune disease that can be severe if not treated.
- Sarcoidosis: This condition can cause skin lesions, including on the scalp, and is associated with inflammation in other parts of the body.
- Rare diagnoses
- Pityriasis amiantacea: A rare condition characterized by thick, yellow scales that adhere to the hair shafts, often associated with psoriasis or seborrheic dermatitis.
- Lichen planopilaris: An autoimmune condition that causes inflammation and scarring on the scalp, leading to hair loss and red, scaly patches.
- Discoid lupus erythematosus: A chronic skin condition characterized by inflammation and scarring type lesions on the scalp, face, and ears.