Thanks for posting your query.
A small injury
itself can cause damage to ear drum.
I would advice you to visit an ENT specialist
and get a thorough clinical evaluation to rule out the chance of occurrence of any damage to ear drum.
Antibiotics has to be administered to relieve infection.
Avoid inserting cotton buds,pins into ear.
Usually the inflammed eardrum
heals completely after 2-3 months.
Hope this helps.