Differential Diagnosis for a Cyst on the Scalp without a Central Dot
- Single most likely diagnosis
- Epidermoid cyst: This is a common type of cyst found on the scalp, and it does not typically have a central dot. Epidermoid cysts are usually filled with a cheesy material and can be found on the scalp, face, and neck.
- Other Likely diagnoses
- Pilar cyst: Also known as trichilemmal cysts, these are common on the scalp and do not have a central dot. They are usually filled with a thick, yellowish material and can be multiple.
- Sebaceous cyst: While sebaceous cysts can have a central dot (punctum), not all of them do. They are common on the scalp and can be filled with a thick, oily material.
- Do Not Miss
- Kerion: This is a severe form of fungal infection of the scalp that can present as a cystic lesion without a central dot. It's essential to consider this diagnosis to avoid missing a potentially serious infection.
- Squamous cell carcinoma: Although rare, squamous cell carcinoma can present as a cystic lesion on the scalp. It's crucial to consider this diagnosis to avoid missing a potentially life-threatening condition.
- Rare diagnoses
- Dermoid cyst: While dermoid cysts can occur on the scalp, they are relatively rare. They can contain a variety of tissues, including hair, skin, and teeth, and may not have a central dot.
- Steatocystoma: This is a rare type of cyst that can occur on the scalp and is filled with a thick, oily material. It does not typically have a central dot.