Thanks for writing in.
From the description mentioned above, the insect bite is getting infected as it has become red and lumpy.
I would recommend you to consult physician if it increases further more in size and cause fever
and severe tenderness. In that case, lesion needs to be left open and cleaned up with antiseptic.
Meanwhile you can try calamine
lotion to cool the surface affected. You can apply same lotion over other affected area also. I hope I have cleared your doubt.