The V-shaped cut-off at the neck indicates that the rash is photo-induced. Look also for sparing behind the ears, under the chin and nose, and in the upper eyelid fold.
Seborrhoeic dermatitis typically affects the eyebrows and nasolabial folds.
Systemic lupus erythematosus can cause a photosensitive rash, but is not a likely diagnosis in a middle-aged man.
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