No worry: Those "knots" are most likely resolving hematomas (bruises). They are soft initially, but as the body takes care of them, they become hard and can stay that way for 6-12 months. Occassionally the firm area will persist indefinitely due to some scar tissue formation under the skin. These areas are veryvduperficial and do not represent any injury to the brain.
Answered 11/18/2020
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