wich got a bit bigger because i scrattched it and keep wanting to feel it to see if it goes, it probably makes it worse ! Having had a look , I would reckon it is a ringworm
, often in the scalp. Overlying hair loss may be noted. The definitive treatment is surgical excision of the cyst. My sincere advice would be to consult a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.