A chronic, intensely itchy photodermatosis featuring excoriated papules and nodules on sun-exposed skin, often with associated cheilitis.
A rare genetic disorder with sun-sensitive telangiectatic erythema on the face, short stature, and an increased risk of cancer.
A severe, persistent, eczematous photosensitivity reaction to a broad spectrum of UV and visible light, leading to marked lichenification of exposed skin.
Congenital erythropoietic porphyria (Günther's disease) causes severe photosensitivity from birth with blistering, skin fragility, red-stained urine, and erythrodontia (red teeth).
A porphyria causing immediate, painful, burning and stinging sensations on sun exposure, leading to erythema and edema but minimal blistering.
A rare childhood photodermatosis, linked to EBV, with recurrent vesicles and papules on sun-exposed skin that heal with characteristic vacciniform (smallpox-like) scars.
A benign photodermatosis in boys, presenting as an itchy, papulovesicular eruption on the helices of the ears in the spring.
A delayed, cell-mediated, eczematous reaction that is strictly limited to sun-exposed areas, caused by a drug that becomes an allergen after UV exposure.
An inflammatory reaction caused by a substance on the skin plus UV light, which can be phototoxic (like phytophotodermatitis) or photoallergic.
A non-allergic reaction resembling an exaggerated sunburn, with erythema and sometimes blistering, strictly confined to sun-exposed areas.
The most common photodermatosis, presenting as a delayed, itchy eruption of various morphologies (papules, plaques, vesicles) on sun-exposed skin after the first intense sun exposure of the season.
The most common porphyria, causing skin fragility, vesicles, and bullae on sun-exposed areas (especially the hands), which heal slowly with milia and hyperpigmentation.
A drug-induced condition (e.g., from NSAIDs) that clinically mimics porphyria cutanea tarda with skin fragility and bullae, but with normal porphyrin levels.
A rare genetic disorder with a characteristic poikilodermatous (atrophy, telangiectasia, pigment changes) photosensitive rash in infancy, skeletal abnormalities, and increased cancer risk.
A rare physical urticaria where pruritic wheals (hives) develop within minutes of sun exposure and resolve quickly once out of the sun.
An acute, painful, erythematous inflammatory reaction of the skin following overexposure to UV radiation.
A porphyria with both the blistering skin photosensitivity of porphyria cutanea tarda and the acute neurovisceral attacks of acute intermittent porphyria.
A genetic DNA repair disorder that leads to extreme sun sensitivity, severe burning, and the very early development of numerous skin cancers.