In the United States, whilst one-quarter of people being investigated for a photosensitivity disorder were diagnosed with<unk> , the prevalence in the general population is 10 to 15% and may even be as high as 40% as suggested in one study of more than 2000 people. It is also particularly more prevalent in Central Europe and Scandinavia.<unk>  is more common in young adults and has a female preponderance with a ratio of 2:1 female-to-male. In Germany the female to male ratio has been cited as 9:1. It can, however, occur in all age groups and all skin types. Those experiencing sun exposure all year round seldom acquire<unk><unk> . Hence, it is less common near the equator. The cases of this condition are most common between the spring and autumn months in the northern hemisphere and at higher altitudes.
Polymorphous light eruption
Lichenoid eruption
Acneiform eruption
Papuloerythroderma of Ofuji
Streptococcal intertrigo
Granulomatous facial dermatitis
Drug eruption
Poikiloderma of Civatte