Direct hits can sometimes cause hair loss, but there are many other causes for hair loss. The stress of an illness, overactive or underactive thyroid, hormone imbalances, medicines used for gouts or using blood thinners are all causes of hair loss. It can also be part of an underlying disease like diabetes or lupus.
Since hair loss can be an early sign of a disease, if you are concerned you sholud go see a doctor
I agree with Gillian. The best thing you can do is see your doctor. The bump may not be related to your hair loss at all. The doctor may be able to determine that your hair loss is not caused by a major illness. This will put your mind at ease.
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