It seems that you may be having insect bit causing insect toxic dermatitis
following secondary bacterial infection.
You consult dermatologist
and have confirmed diagnosis.
Strong antibiotics with anti inflammatory drugs may be taken.
To rlievecitching, you take anti histaminic like levocetirizine
Apply antibiotic cream like sisomycine cream.Bed rest
is also needed.
You may be alright.
Dr. Ilyas Patel MD