HEMOTYMPANUM is a condition where blood collects behind the  ear drum due to fracture or head injury or any blood disorders. 
Other common cases   are due to  1)INFECTION ( rhinosinusitis, ie affecting nose and sinuses) 
2) NASAL ALLERGY  which lead on to Eustachian tube block( which connects nose and ear) 
3) EUSTACHIAN TUBE BLOCK ( in children due to adenoiditis or other lesions) 
4) BAROTRAUMA
The features of fluid in the middle ear( behind tympanic membrane) are ear fullness, hearing loss, ringing sound, and sometimes imbalance. Ear drum appears dull, retracted and fluid may be there sometimes and it appears blue. 
Treated  by certain manoeuvres ,medically, and if it's a chronic problem causing hearing loss, has to be treated surgically. 
Highly informative
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