- Diffuse, erythematous, scaly skin condition, w/multiple possible causes including: cutaneous t-cell lyphoma, drug hypersensitivity, HIV, psoriasis, idiopathic, other
- Erythematous erruption, scale, warmth, puritus, pain; progresses over days to weeks
- Extensive red, scaly patches, plaques
- Affects > 90% of body