Thanks for writing in.
The rash you are describing can be herpes zoster
,insect bite,fungal infection
, contact dermatitis
You can apply calamine lotion over the area.It is a cooling and soothing lotion.
Also you can take tab Zyrtec for itching.
Also you can apply lotrimin cream over the area.
Visit a qualified dermatologist
for proper diagnosis and treatment.
Hope this helps.