Welcome to HCM and thanks for posting your query here.
The description you are giving seems to be a sebaceous cyst. Sebaceous glands are a type of skin glands which will produce sebum in the human beings. They are like sweat glands. The sebum gives a peculiar odour to every human being. If the mouth of the gland is blocked it causes the retention of the sebum within the gland and causes a cyst formation. The blocked opening can be seen as a dark spot in the middle of the cyst.
It is very common on the back, face, scalp
, behind the ears. The palms and soles are spared.
If the cyst is infected by the cutaneous organisms it gives an inflammed appearance like- redness
around the cyst, swelling around the cyst and a bad smell.
The treatment of the cyst depends on its site and size. A simple cyst
without any symptoms can be left like that. If infected it can be treated with antibiotics and antiinflammatory drugs. If the size of the cyst is more or cosmetically problem then simple excision is advised. If the total cyst is removed with the capsule chances of recurrences are rare.
Final diagnosis of your swelling can be made by looking it directly. Please visit your surgeon who will guide you in a right way.
Hope this is helpful to you.