Infection
Cellulitis
Candida
Tinea
Bug bite reactions
Impetigo
Pityriasis rosea (herald patch)
Lyme disease
Autoimmune/Inflammatory
Eczema, atopic
Nummular eczema
Contact dermatitis
Psoriasis
Discoid lupus
Urticaria
Xerotic eczema
Cancer:
Basal cell carcinoma
Mycosis fungoides
Drugs:
Fixed drug eruption
Granuloma annulare
Erythema multiforme