Sayang, any new lump or changes on your breast memang perlu check dengan doctor segera okay, jangan tunggu lagi. It's really important to get this checked properly, especially kalau you're worried. I know it's scary, but a proper examination by a doctor is the only way to know what it is and what to do next. Don't rely on online advice for something like this, please make an appointment or go to a clinic soon. Sending you lots of courage!