Hello! Welcome to HCM. This can be a sebaceous cyst or dermoid or even a lipoma, all benign swellings. Did you have trauma there? So then its hematoma, clotted blood. Local examination is necessary. Pain & itching indicates presence of infection. Antibiotics & anti-inflammatory drugs with your doctor s opinion. In my clinic, I do an X-ray skull to rule out any intracranial extension of the lump & if there is no such extension, excision biopsy i.e. removal of lump under local anaesthesia is done and sample is sent for histopathological examination. Hope this helps. Wish you healthy life. Thanks. Regards.