| Pigmented | Freckle, lentigo, seborrheic keratosis, nevus, blue nevus, halo nevus, atypical nevus, melanoma |
| Scaly | Psoriasis, dermatitis (atopic, stasis, seborrheic, chronic allergic contact or irritant contact), xerosis (dry skin), lichen simplex chronicus, tinea pedis/cruris/corporis, tinea versicolor, secondary syphilis, pityriasis rosea, discoid lupus erythematosus, exfoliative dermatitis, actinic keratoses, Bowen disease, Paget disease, drug eruption |
| Vesicular | Herpes simplex, varicella, herpes zoster, pompholyx (vesicular dermatitis of palms and soles), vesicular tinea, autoeczematization, dermatitis herpetiformis, miliaria crystallina, scabies, photosensitivity, acute contact allergic dermatitis, drug eruption |
| Weepy or encrusted | Impetigo, acute contact allergic dermatitis, any vesicular dermatitis |
| Pustular | Acne vulgaris, acne rosacea, folliculitis, candidiasis, miliaria pustulosa, pustular psoriasis, any vesicular dermatitis, drug eruption |
| Figurate (“shaped”) erythema | Urticaria, erythema multiforme, erythema migrans, cellulitis, erysipelas, erysipeloid, arthropod bites |
| Bullous | Impetigo, blistering dactylitis, pemphigus, pemphigoid, porphyria cutanea tarda, drug eruptions, erythema multiforme, toxic epidermal necrolysis |
| Papular | Hyperkeratotic: warts, corns, seborrheic keratoses Purple-violet: lichen planus, drug eruptions, Kaposi sarcoma, lymphoma cutis, Sweet syndrome Flesh-colored, umbilicated: molluscum contagiosum Pearly: basal cell carcinoma, intradermal nevi Small, red, inflammatory: acne, rosacea, miliaria rubra, candidiasis, scabies, folliculitis |
| Pruritus1 | Xerosis, scabies, pediculosis, lichen planus, lichen simplex chronicus, bites, systemic causes, anogenital pruritus |
| Nodular, cystic | Erythema nodosum, furuncle, cystic acne, follicular (epidermal) inclusion cyst, metastatic tumor to skin |
| Photodermatitis | Drug eruption, polymorphic light eruption, lupus erythematosus |
| Morbilliform | Drug eruption, viral infection, secondary syphilis |
| Erosive | Any vesicular dermatitis, impetigo, aphthae, lichen planus, erythema multiforme, intertrigo |
| Ulcerated | Decubiti, herpes simplex, skin cancers, parasitic infections, syphilis (chancre), chancroid, vasculitis, stasis, arterial disease, pyoderma gangrenosum |