It's a rule of thumb that if you feel a solid mass or notice any changes in your breasts, you should have it checked ASAP. If you're breastfeeding, this is commonly normal. After giving birth, I also noticed a hard, immovable lump in one of my breasts. I became worried and had it scanned via ultrasound. Thankfully the doctor said it's just a galactocele, a cyst filled with milk, and eventually it will shrink as I nurse my bubba.
As for the trauma, my OB said that it's not really a cause of concern. If you develop lumps through trauma, they also go away on their own. You can check about fat necrosis regarding this. Don't worry, everything's gonna be fine!
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