Hello and welcome to HCM,
You are having a painful swelling around 1-2 cm in diameter on the upper torso with skin intact on its surface.
Intact skin on the surface of the swelling suggests that the selling is not arising from the skin.
It is probably arising from underlying structures or from skin adnexal structures.
An excision
biopsy is most appropriate in such a lesion.
However, you need to consult your doctor for clinical examination.
Before undergoing excision biopsy, a fine needle aspiration (FNA) may be required.
However, this will be decided by your examining doctor.
FNA will determine that origin and nature of the lesion.
Excision biopsy can follow FNA and histopathological examination thereafter.
Thanks and take care
Dr Shailja P Wahal