After the bite, it is very difficult to identify the causative insect because almost every insect bite have similar symptoms like red lump which later turn in to pustule with swelling in the surroundings and itchy conditions. You can only suspect an insect if you saw any insect after the bite. The more important thing is to treat the bite. This can be done by applying hydrocortisone and taking anti allergy medicines or more proper way is to visit doctor.

 Have a doctor check this out. MRSA and other types of staph infections are usually mistaken as insect bites. If this is the case you will need proper
antibiotic after a culture. It may not be a bite!