Thanks for writing in.
What you could be suffering from is possibly an allergic reaction
or a an infection ( which could be bacterial or viral). It can also be herpes zoster
, if you suffered from chicken pox
in the past. You can take tablet cetrizine 10 mg once a day for 3-4 days for the itching. You can also apply calamine lotion on the affected area. The pain is suggestive of an infection, which would require a course of antibiotics or anti-virals depending on the identified cause. please see a dermatologist
for the same.
Hope this helps.