Hello doctor. I have a swollen lymph node in my groin on the left side, 2cm from the labia majora and slightly tilted down to the anus. This lymph node has been there for a while now and is as small as a normal benign lymph node. When my body is hot, such as when my back and neck have pimples, this lymph node swells a bit but is not painful. After the pimples on my skin and back subside, the lymph node becomes small again like a benign state. So I would like to ask the doctor if it is okay to have a painless lymph node in the genital area? How to distinguish between benign and malignant lymph nodes? Thank you for your advice.