Mummies, especially Greater Mummies, have a special effect added to their melee attack. If they hit you, the icon "Diseased" (it looks like a pink, crumbling, plus sign) appears on your portrait icon, and you lose a few hitpoints every round, for the next few rounds. It's not permanent, the damage can be cured like anything else, and the effect isn't too dangerous unless you take multiple hits.
But that doesn't sound like what you have. An excerpt from Volothamp's Comeuppance:
Quote:
Contagion
Type: Wizard (Necromancy)
Level: 4
Casting Time: 4
Duration: Permanent
Saving Throw: Negates
Range: Sight
Target: Creature
Area of Effect: Creature
Description: If the targeted creature fails to Save vs. Spells, their skin erupts in a painful rash, with open, festering sores, infected lesions oozing pus, etc. Their Strength, Dexterity and Charisma all take -2 penalties, and the creature is Slowed. The condition is permanent until healed with a Cure Disease spell.
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I've never seen a Mummy cast Contagion, but you might be playing with Weimer's Improved Undead installed, or you might simply lost track of who cast what, in the confusion of battle.