Got a bad mosquito bite. Any suggestion would be appreciated

Antihistamines. Mosquito bites cause your skin to release histamine, a hormone that triggers inflammation and terrible itching. Topical and oral antihistamines such as benedryl block this reaction reducing itching. Topical cortisone cream can also reduce inflammation. Remember, for both antihistamine and cortisone the sooner you start them, the more relief you'll get.
Baking soda+vinegar. Make a pultice with baking soda and apple cider vinegar. Apply to bite sites for comfort and to reduce inflammation. Alternatively, if you are near an Asian grocery store, you can purchase eagle brand eucalyptus oil. Provided you are not allergic to aspirin. Apply this oil to the bite areas to reduce inflammation.