Thank you for the query and Welcome to HCM.Mantoux test
is a diagnostic tool for TB. 2/3 days after injection, the injection site will be inspected for induration (i.e. raised palpable hard area) if any. The diameter of the swelling is important for TB infection determination.
Swelling and itching at injection site reveals immune reaction that is the principle of Mantoux test.ESR
indirectly determines the inflammatoy status of the body. ESR 50 is not normal.
Hope you got your answer.