Background: Occasionally, the need arises to patch-test patients while they are on immunomodulators. Little is known about how these systemic agents affect the results of patch testing.

Q: We started to notice these spots in the St. Augustine in late summer and they are still here. They began as yellowed grass. Many started out round. There is a slight dip along the line of the spots ...

Of 38 patch-test reactions, 15 (39%) were positive to antibiotics. The majority were due to penicillins (57% [12 of 21]); one in each case was due to cephalosporins (1 of 3), clindamycin (1 of 3 ...