i'd suggest you get this looked at. chances are it's a common wart or something benign but there's always a possibility it's a skin cancer. obviously you'd want to treat that right away. no need to rush to the emergency room. i'd suggest you make an appointment with a dermatologist or your primary care provider. meanwhile try not to scratch it squeeze it or pick at it. any of that type of behavior can break open the skin and make it easy for bacteria to enter. you don't want to get a skin infection on top of this! feel free to wash or shampoo as normal. this should not cause any ill effects to the bump. be a bit careful combing or brushing your hair so you don't catch the bump on the implement and tear it off or something. hope this helps!
i have a pencil size growth that has appeared at the hairline in th middle of my forehead. slightly itches and tender. it has a thin dark brown line around half of the area and a small dark brown center.