Hello and welcome to HCM.
Herpes zoster (shingles) last for 3-5 weeks.In 14% out of them, post herpetic pain and altered sensation at site lasts for long beyond 1 month.
If I were your treating doctor,I recommend,
-Tablet valacyclovir 1 mg thrice a day for 7-10 days (prescription drug) to be taken as soon as possible after diagnosis
-Cold compresses can be obtained over the affected part after the above course is over when the lesion dried.
-Local application of calamine lotion gives soothing effect.
-If pain present,tab
tramadol as and when needed.
-Oral anti histaminic like
cetrizine to relieve itching
As your lesion was on your forehead,I would recommend you to visit ophthalmologist as well to rule out any effect on eye (quite possible in your case)
If the
tingling,numbness,pain persist beyond 1 month,visit to physician,in that case you may be started on drugs like
gabapentin for your nerves.
Hope this information helps.
Thanks and regards.