SUPERFICIAL PERIVASCULAR DERMATITIS
PSORIASIFORM - PSORIASIFORM ONLY
| Lymphocytes predominate | Spiraled capillaries in thin dermal papillae, rete ridges of uniform length some rete ridges thinned | Psoriasis |
| Rete ridges of uneven length, parakeratosis, no spiraled capillaries | Allergic contact dermatitis Nummulardermatitis Dyshidrotic dermatitis, late stage |
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| Checkerboard pattern of orthokeratosis and parakeratosis | Pityriasi rubra pillaris | |
| Scale-crust at lips of infundibular ostia | Seborrheic dermatitis | |
| Hyphae in cornified layer Psudohyphae in cornified layer |
Dermatophytosis Candidiasis |
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| Hyperkeratosis, hypergranulosis, coarse collagen bundles often perpendicular to skin surface in thickened papillary dermis | Lichen simplex chronicus Prurigo nodularis Acanthoma fissuratum Pressure papule from prosthesis Surfer's nodules Chondrodermatitis nodularis helicis |