Differential Diagnosis for Patchy Hair Loss with Itching
- Single most likely diagnosis
- Alopecia areata: This condition is characterized by patchy hair loss, often accompanied by itching, and is an autoimmune disease that affects hair follicles.
- Other Likely diagnoses
- Tinea capitis (ringworm of the scalp): A fungal infection that causes hair loss, itching, and redness on the scalp.
- Psoriasis: An autoimmune condition that can cause itching, redness, and hair loss, especially when it affects the scalp.
- Seborrheic dermatitis: A skin condition that can cause itching, flaking, and hair loss, particularly on the scalp.
- Do Not Miss
- Lupus: A systemic autoimmune disease that can cause hair loss, itching, and skin rashes, and if left untreated, can lead to serious complications.
- Thyroid disorders: Both hypothyroidism and hyperthyroidism can cause hair loss and itching, and are important to diagnose due to their potential impact on overall health.
- Rare diagnoses
- Lichen planopilaris: A rare inflammatory condition that causes hair loss, itching, and scalp redness.
- Discoid lupus erythematosus: A chronic skin condition that can cause hair loss, itching, and scarring on the scalp.
- Trichotillomania: A psychological disorder characterized by compulsive hair pulling, which can lead to patchy hair loss and itching due to skin irritation.