What cause the wheal or bleb contained by tuberculin skin experiment? what is the appliance involved?

will it remain forever? thank you
Answers:
the little bump is caused by the syringe forcing a liquid into your intradermal tissue (intradermal means inwardly the skin). this pushes the top layer of skin upwards, causing the bump. it should absorb like greased lightning. i bet you that tomorrow, it wont even be there.

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