Hello dear I understand your concern Mosquito bite produce allergic reaction and dermatitis reaction. Check for the diabetes by fasting blood sugar as diabetes cause delay healing. Take following advises: Apply cold compression Mosturizer cream like epigen Helilac silicone gel If redness is there then apply Mild steroid and oral allegra medication Take healthy diet with multivitamin and antioxidant to improve immunity Hope this may help you Contact HCM for further health query Best regards Dr. Sagar