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It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided.
Based on the information i think either these is contact dermatitis
or insect bite or the scabies
They can be diagnosed by examination as they will present with typical rash
. The treatment options will also very.
Presently i advice you to wash the affected area with mild soap. Topical antihistamine creams will be helpful in addressing the itching, these re over the counter medication
If the symptoms are due to insect bite or due to contact dermatitis, further exposure should be avoided and the above mentioned treatment will be helpful.
In case of scabies there are specific treatment can be considered only after exact diagnoses. i advice you to see dermatologist
if the symptom persists or the severity increases.