Intradermal Testing

Dur­ing an intra­der­mal test, an aller­gist will inject a small amount of the aller­gen just below the sur­face of the skin on either your arm or back. Intra­der­mal test­ing is bet­ter for aller­gens that dis­play weak­er aller­gic reac­tions. In approx­i­mate­ly 15 min­utes, a red bump will appear in that spot if you are pos­i­tive for hav­ing an aller­gy. Any red bumps that appear dur­ing the skin test will dis­ap­pear after about 30 minutes.

Sources:

Amer­i­can Col­lege of Aller­gy, Asth­ma, and Immunol­o­gy (acaai​.org)

The Amer­i­can Acad­e­my of Aller­gy, Asth­ma & Immunol­o­gy | AAAAI