Differential Diagnosis for a New Mole on the Scalp
Single Most Likely Diagnosis
- Benign inflammatory or infectious lesion: Given that the mole is pink, sore to touch, and of a single color, it could be a benign inflammatory or infectious lesion such as a folliculitis or an inflamed sebaceous cyst. The symptoms suggest a reaction or infection rather than a malignant process.
Other Likely Diagnoses
- Irritated seborrheic keratosis: This is a common benign skin growth that can become irritated and inflamed, especially if it's located in an area prone to friction or scratching, like the scalp.
- Angioma: A benign vascular tumor that can appear as a small, pink, and sometimes sore lesion.
- Pyogenic granuloma: A benign vascular lesion that can appear as a small, pink, and sore nodule, often in response to trauma or injury.
Do Not Miss Diagnoses
- Amelanotic melanoma: Although less likely due to the single color and the description, amelanotic melanoma is a dangerous form of skin cancer that lacks pigment and can appear as a pink nodule. It's crucial to consider this diagnosis to ensure timely treatment if it is present.
- Squamous cell carcinoma: This type of skin cancer can appear as a sore or scaly patch and might be tender to the touch. Early detection is key for effective treatment.
Rare Diagnoses
- Dermatofibroma: A rare, benign skin growth that can appear after a minor injury, typically on the legs but can occur elsewhere, including the scalp. It might be sore or tender.
- Keratoacanthoma: A rare, low-grade (rarely malignant) skin tumor that can resemble a small volcano, sometimes tender and can resolve on its own but may need to be differentiated from squamous cell carcinoma.
- Mastocytoma: A rare benign growth of mast cells in the skin, which can appear as a pink, itchy, or sore lesion.