The most common sun-sensitivity condition: an immune-mediated rash - itchy bumps, patches, or blisters on newly exposed skin, hours to days after the first strong sun of the year - that eases as summer builds tolerance and recurs annually, usually starting in the teens or 20s.
It is benign: resolves without scarring in about 10 days. Management: shade the flare, OTC hydrocortisone or antihistamine for itch, and graduated spring exposure plus high SPF to prevent the rerun; severe cases get prescription treatment or supervised phototherapy "hardening." Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper .
What to do
Common questions
What is polymorphic light eruption?
The most common sun-sensitivity condition there is - an immune-mediated rash that erupts on sun-exposed skin, typically in spring or on the first strong-sun vacation, in people whose skin has lost its winter tolerance. Mayo Clinic's picture: hours to days after stronger-than-usual sun, itchy bumps, raised patches, or blisters appear on the newly exposed areas - chest, neck, forearms - sparing, oddly, the face and hands that see sun year-round. Two signatures make the diagnosis recognizable: it flares with the season's first serious exposure and then eases as summer progresses (skin "hardens" - the tolerance builds with repeated exposure), and it recurs year after year, usually starting in the teens or 20s. It looks alarming and it is benign: it resolves on its own, without scarring, in about 10 days. Management: sun avoidance during the flare, cool compresses, an OTC hydrocortisone or antihistamine for the itch, and - the real strategy - graduated spring sun exposure and high-SPF sunscreen to prevent the annual rerun. Severe or persistent cases get prescription steroids or medically supervised "hardening" (phototherapy) before sunny trips. A first-ever episode deserves a clinician's eye, because lupus and medication photosensitivity can mimic it.