Linflas

Hi there, Lately, I've got this skull-shaped icon in the corner of my screen, and every NPC tells me to go the hell away with my magic, as if I had summoned a daedra or an undead, which I wasn't doing. Plus, there's a kind of faint green smoke dripping from my clothes. I can't see what it can be in the active effects list. I tried to dispell all spells to no avail. Has anybody an idea ?