Differential Diagnosis for Papules on Scalp with Itching
- Single most likely diagnosis
- Seborrheic dermatitis: This condition is characterized by an itchy, inflammatory rash on the scalp, often accompanied by flaky skin. It's a common condition that matches the symptoms described.
- Other Likely diagnoses
- Psoriasis: An autoimmune condition that can cause itchy, scaly papules on the scalp. The presence of similar lesions on other parts of the body could support this diagnosis.
- Eczema (atopic dermatitis): Can cause itchy papules and is often seen in individuals with a history of allergies or asthma.
- Pediculosis (head lice): Although more commonly associated with itching and crawling sensations, papules can occur due to the body's reaction to lice bites.
- Folliculitis: An inflammation of the hair follicles, which can be caused by bacterial or fungal infections, leading to itchy papules or pustules on the scalp.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Malignant tumors (e.g., cutaneous T-cell lymphoma): Although rare, these conditions can present with skin lesions and itching. Early diagnosis is crucial for effective treatment.
- Infections (e.g., tinea capitis, kerion): Fungal infections of the scalp can cause itchy papules and should be treated promptly to prevent complications.
- Rare diagnoses
- Keratosis pilaris: A condition characterized by rough, itchy papules, typically on the arms or legs, but can occasionally affect the scalp.
- Pityriasis rosea: A rash that can start with a single patch on the scalp and spread, accompanied by itching.
- Darier's disease: A rare genetic disorder that affects the skin, causing itchy, greasy papules, among other symptoms.