### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I have a cyst under my skull behind my right ear. Its almost in my neck, but still the hair area. Its there for about 14 years. It makes my neck very stiff and hurts alot from time to time. The pain usually goes up to my head and down to my right shoulder. Its not visible to the eyes, but if you touch it you can feel its hardness. Ive mentioned it to many doctor and all they do is give me mucle relaxing and exercise. I even went to an cirugian to get it removed and he said he couldnt see it, so he couldnt renove it (I couldnt help to laugh). Can you tell me anything about it, please?

### output:

Hi, Dear,Good evening. Thanks for your query to my virtual Chat Doctor Clinic. I studied your query in-depth. In My opinion-diagnosis is-? Dermoid Cyst ? Sebaceous Cyst?or it could be a chronic mastoiditis-as the pain and tenderness is felt.? Or it could be -Normal -Mastoid tuberosity with tenderness due to the deep pressure on it-misunderstood by you as-hard cystic lump behind the right ear. AS the Surgeon could not see and detect it-you would need-X-ray Skull, USG of the Cystic Swelling, and or-CAT scan or MRI to confirm the diagnostic probabilities. Treatment-Would be-a-Surgical Excision- if it's proved to by lump-? Desmond or ? Sebaceous Cyst, b-Chronic mastoiditis-would be cared by Tb-NSAIDs, Antibiotics with Surgical debridement of the mastitis by a ENT Surgeon-Hope this would resolve your worrying query. Wellcome for more query from you. Good day.