###Human: Can mosquito bite cause leg swelling? ###Assistant: Hello. It looks like you had cellulitis. You might have scratched your leg and later on it has developed an infection. I think you are accumulating gas in your foot and in your leg. I think you should be seen by an orthopedic surgeon sooner rather than later. You need a complete examination of that foot with x-ray, CT scan and blood cultures. I am also afraid, if you are bone has been involved with the infection known as osteomyelitis. I do not think it is because of a mosquito bite.Please let me know if you need any further assistance. I will need to know the results of the x-ray and the blood cultures to suggest any antibiotics. 1. Gas gangrene. 2. Osteomyelitis. CBC (complete blood count), kidney and liver function test, electrolytes, CRP (C-reactive protein), x-ray of the foot and lower leg. Consider CT scan of the leg as well. Revert back with the reports to an internal medicine physician online.--->