skin reaction to pathergy test, anyone else?

[pattismith]

Pathergy test is usually done for Behcet diagnosis (immune vasculitis).

It's a multiple needle prick. The result is positive if a papule appears at 24-48 h00 reading.

The papule sometimes starts after a few hours;

I did the test, and it was negative at 24h00. However I got a papule quickly after the test (picture below) that faded away during the next 24h00. it's strange, anyone else have that?

 

[pattismith]

Improved sensitivity of the skin pathergy test with polysaccharide pneumococcal vaccine antigens in the diagnosis of Behçet disease​

2023

https://pubmed.ncbi.nlm.nih.gov/36171681/