Condition	Characteristics
Discoid lupus erythematosus	Hyperpigmented patches or plaques, often with hypopigmented areas; typically involves sun-exposed areas
Systemic cutaneous lupus erythematosus	Erythematous papulosquamous patches on photo distributed areas mainly on upper body
Erythema ab igne	Mottled and reticulated nonblanching erythematous patches; usually in localized area corresponding to exposure to a nonburning heat source
Erythema chronicum migrans	Erythematous patch with expanding annular erythema; possible history of tick bite
Livedo reticularis	Reticulated erythema on extremities with red and blue coloration