Pathology
Acute:
- Spongiosis
- Vesicles / bullae
- +/- eosinophils
- Perivascular lymphocytes
Subacute:
- No vesicles
- Spongiosis (more subtle)
- Acanthosis, hyperkeratosis, parakeratosis
Chronic:
- Epidermal thickening, psoriasiform
- ↓ spongiosis & inflammation
- ↑ mast cells
- ↑ dermal fibrosis