Pityriasis and T cell involvement?

[koscs000 at MZDMZA.ZDV.UNI-MAINZ.DE]

Hello out there,

does anybody have any information about the role of T cells in 
"Pityriasis rosea" (P.r.) ? Or a possible link between P.r. and "contact 
dermatitis" (i.e. eczema of rubber gloves)? Can something like nickle (Ni) 
cause P.r.?

Will be glad for some hints,

Frohe Weihnachten-Merry Christmas,

Steffen (koscs000 at goofy.zdv.uni-mainz.de)