Welcome to HCM,
Your skin condition is most likely Post herpetic neuralgia
, if you had some group papule and vesicle on that side previously.
You could try the following
75 mg daily for 7 days then 75mg twice daily for 2 weeks.
Apply a cream/gel containing capsicin with or with out menthol 2/3 times daily.
Consult us 1 or 2 weeks later if no response with above drugs.