Dermal changes in psoriasiform dermatitis
| Psoriasiform dermatosis | Dermal changes |
|---|---|
| BVs, blood vessels; LSC, lichen sclerosis chronicus; MF, mycosis fungoides; PLC, pityriasis lichenoides chronica; PR; pityriasis rosacea; PRP, pityriasis rubra pilaris; PVLI, perivascular lymphocytic infiltrate; RBCs, red blood cells; +, present;−, absent. | |
| Psoriasis | PVLI; mild oedema, dilated vessels |
| Drug reaction | PVLI or band-like infiltrate; ±eosinophilic infiltrate |
| Chronic allergic/contact and atopic dermatitis | PVLI; ±eosinophilic infiltrate |
| Fungal infection | PVLI; +neutrophilic infiltrate |
| LSC | PVLI; reactive fibroblasts; papillary fibrosis |
| Scabies | Moderate PVLI; numerous eosinophils in deep dermis |
| Seborrheic dermatitis and HIV dermatitis | Mild PVLI |
| PRP | Mild PVLI |
| PR | PVLI; focal extravasated RBCs |
| Syphilis | Band-like lymphocytic infiltrate; numerous plasma cells; vascular endothelial proliferation; thick BVs; histiocytes, rare eosinophils |
| PLC | PVLI |
| MF | PVLI; atypical lymphoid cells |