Swelling after being bitten by a mosquito on the arm is considered to be insect bite dermatitis, or co-infection, generally use topical glucocorticoids or fusidic acid ointment and other antibiotic medication.
Mosquito bites swollen arm, you can use a cold towel local cold compresses to promote swelling, while relieving the symptoms of local itching. You can also use boric acid solution, cold saline and other local compresses can reduce swelling, local application of mometasone furoate ointment or fusidic acid cream treatment, do not squeeze, do not scratch to avoid aggravation of symptoms.
If the symptoms are more obvious, you need to take the anti-allergy drug loratadine, accompanied by redness, swelling and hot pain symptoms at the same time to give antibiotics such as amoxicillin and other drugs combined treatment.
All of the above medications should be used under the guidance of a doctor, avoid self-medication.