Lady with a bump on her head

70y old, white woman with PMH of depression, presents to the clinic for a routine check-up. Examination of her scalp shows a smooth, firm, dome-shaped 4- 5 cm nodule with no signs of inflammation or punctum. The patient states that she has had this tumor for “as long as I can remember”.

What is the diagnosis?

1. Epidermoid cyst
2. Trichilemmal cyst
3. Epidermal inclusion cyst
4. Dermatofibroma