- Thought to be viral assoc
- Initial eruption is 2-5cm scaly "herald patch" on trunk, neck or legs
- Followed w/in days to weeks by wider spread eruption→ trunk, neck, back, legs→ many oval, scaly, patches
- Variably puritic
- Lasts 6-8w, then resolves spontaneously
- Many oval, scaly, patches w/central clearing
- Can have "Christmas tree" distribution, often on back