Any time a mosquito falls into the ear, you should seek medical attention. Do not try to remove it yourself, but try dropping vegetable oil or alcohol into the ear canal to avoid mosquito damage to the ear canal.
If the mosquito falls into the ear is dead, you can use saline to rinse it out and clean the ear canal.
If the mosquito that fell into the ear is alive, do not keep trying to take it out by yourself with cotton swabs or ear spoons, as this may stimulate it to go deeper into the ear and make it more unfavorable to take it out, and may even cause some damage to the ear.
If you have access to a doctor, you should seek medical attention as soon as possible. Anesthetics (e.g., procaine hydrochloride) should be dripped into the ear canal, and the ear canal should be cleaned after it is removed. If you do not have access to a doctor, you can put drops of vegetable oil in the ear canal for a brief temporary treatment, and then go to the hospital for further treatment.
The medicines mentioned above should be used under the supervision of a physician.