### Causes and Treatment Recommendations for Infant Scalp Protrusion Without Hair **Disease Description** The condition you described, where there is a thumb-sized protrusion on the scalp without hair, may be due to congenital skin development abnormalities such as sebaceous nevus, neurofibroma, or other benign skin tumors. These conditions are often present at birth or early infancy. **Treatment Recommendations** 1. **Medical Examination**: It is recommended to take your child to a regular hospital's dermatology or pediatrics department for a detailed examination. The doctor may suggest a skin biopsy or imaging tests to confirm the diagnosis. 2. **Post-Diagnosis Treatment**: If diagnosed as sebaceous nevus, immediate surgery is usually not required unless there is infection, ulceration, or other complications. For neurofibroma or other benign tumors, the doctor will decide whether surgery is needed based on the specific situation. 3. **Post-Surgery Care**: If surgery is needed, follow the doctor's post-operative care advice, keep the wound clean, and prevent infection. **Hospital Recommendation** You can choose to go to a large public hospital or specialized hospital in your area, such as a tertiary hospital's dermatology department or children's hospital. These hospitals usually have more comprehensive medical equipment and professional medical teams. **Precautions** During the treatment process, parents should closely monitor the child's condition changes and seek medical attention if any abnormalities occur. Maintain communication with the doctor to understand the progress and handling of the condition. **Allergy and Medical History** The information about no allergies and no past medical history is very important for the doctor's diagnosis and treatment plan. Please ensure to provide relevant information truthfully when visiting the doctor.