Superficial reaction to an insect "bite", vs. pruritic urticarial appules and plaques of pregnancy (PUPP); reaction to an insect "bite" vs. lymphomatoid papulosis; leukocytoclastic vasculitis vs. livedo vasculitis; erythema multiforme vs. graft-versus-host diseases, acute phase; lichen planus vs. lichenoid drug eruption; discoid lupus erythematosus vs. dermatomyositis; atrophic lichen planus vs. atrophic discoid lupus erythematosus; pityriasis lichenoides acuta vs. pityriasis lichenodes chronica; photoallergin dermatitis vs. photoxic dermatitis; erythroderma of psoriasis vs. erythroderma of mycosis fungoides; mucosis fungoides, plaque stage vs. adult T-cell leukemia/lymphoma, (papular stage); pseudolymphoma with lymphoid follicles vs. follicular lymphona; xanthogranuloma vs. necrobiotic xanthogranuloma; xanthomatous dematofibroma vs. xanthomatous malignant fibrous histiocytoma; pyogenic granuloma vs. bacillary angiomatosis; angiolymphoid hyperplasia with eosinophilia vs. Kimura's disease; common baldness vs. telogen effluvium; trichotillomania vs. traction alopecia; steatocystoma vs., eruptive vellus hair cyst; folliculo-sebaceous cystic hamartoma vs. steatocystoma; dilated pore vs. pilar sheath acanthoma; trichoadenoma vs. microcystic adnexal carcinoma; trichoepithelioma vs. infundibulo-cystic basal-cell carcinoma; trichoblastoma, small nodular type vs. trichoblastoma, large nodular type; trichoblastoma, small nodular type vs. basal-cell carcinoma, small nodular type; fibrofolliculoma vs. trichodiscoma; apocrine hidradenoma vs. eccrine hidradenoma; approcrine mixed tumour; verrucous seborrheic keratosis vs. verrucous epidermal nevus; solar keratosis vs. Bowen's disease; keratocanthomatous verruca vulgaris vs. verrucous keratoacanthoma; solitary keratoacanthoma vs. subungal keratoacanthoma; "Primary" extramammary Paget's disease vs. "Secondary" extramammary Paget's disease; angioma on the leg of a young person vs. Kaposi's sarcoma, plaque stage, on the leg; Kaposi's sarcoma, plaque stage vs. angiosarcoma, plaque stage; palisaded and encapsulated neuroma vs. Schwannoma, type A; leiomyuoma vs. infantile myofibromatosis; superficial congenital nevus vs. deep congenital nevus; Miescher's nevus, intradermal type vs. Una's nevus, intradermal type; dysplastic nevus, compound type vs. Clark's nevus, compound type; congential nevus, junctional type, on a palm or sole; intra-epidermal proliferation of melanocytes on sun-damaged skin vs. malignant melanoma in situ on sun-damaged skin; pigmented spindle-cell variant of Spit's nevus vs. pigmented spindle-cell variant of malignant melanoma; deep penetrating nevus vs. deep penetrating melanoma; complete regression of a Clark's nevus vs. complete regression of a melanoma.
