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Your symptoms are suggestive of herpes zoster
which is usually a viral infection and affects one particular dermatome i e part of skin supplied by single nerve
. This is characterized by small blisters which are fluid filled and are present along the skin supplied by the affected nerve. I suggest you get an examination done by a GP nearby you to rule out herpes zoster. This disease is also associated with swelling of lymph
nodes that drain that region.