Thank you for posting your query.
First of all, I would like to reassure you that the tiny lump on your forehead is not suggestive of any serious problem.
Most likely, it is a small hematoma
(blood collection), that has got hardened.
You could show it to a surgeon and get examined. In most cases, it can be left behind, and it would slowly reduce in size and disappear.
However, if it becomes painful or gets infected, it may require surgical treatment
Wishing you good health,
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist