Thanks for writing in HCM.
The condition can be allergic contact dermatitis
, lichen planus
, nummular eczema
,purpuric dermatitis etc.Diagnosis cannot be made without visual clue.
Treatment depends on diagnosis.A visit to dermatologist
will confirm the diagnosis.A skin biopsy may be required for diagnosis.
Till the time you can take tab.Cetirizine 10 mg twice daily .It willl help in decreasing itching.
Hope this helps.