Chest hard circular object and pain sometimes

In my left chest beside my nipple I have a hard object under skin. It is hard and it doesn't change its size. sometimes deep pain but when I round my breast it's doesn't pain.Is this dangerous?please help me ?

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The yellow circle is the hard circular object position.

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Dear Ahri,
My suggestion to you is to go to your physician for an examination. Is this hard circular object moveable or is it fixed to the underlying tissue? How large in mm or cm is the mass?
You need to make an appointment ASAP! May I ask your age? While it is rare for men to have breast cancer, it can occur.
I look forward to hearing from you.
I am a Nurse Practitioner in the States.
Best Regards
Merry Juliana

I was just about to ask those same two questions.

it is fixed and my age is 28.

Dear Ahri,
Please make an appointment to see your physician today. If it is fixed, meaning you cannot lift the mass up, it could possibly be cancer. If it has smooth borders, it is more likely benign. You will need a mammogram, and possibly a biopsy. Does the mass have smooth borders? How large is it?
I had breast cancer. Which country are you located?
Please let me know when you have your appointment and mammogram. I know you are worried. I care about you.
Best Regards
Merry Juliana

It could be an issue with your nipples. I do not see it as cancerous.