Lime juice + sunlight = DNA-level skin destruction. This is phytophotodermatitis, caused by furocoumarins (psoralens) in citrus. Here's the mechanism:
UVA photons hit psoralens → structural transformation → molecules intercalate into DNA strands → cell death cascade initiates. Reaction peaks 24-48h post-exposure with blistering and intense inflammation at contact sites.
Limes have the highest psoralen concentration, but lemons, celery, wild parsnip, parsley, and fig sap trigger the same pathway. Post-healing hyperpigmentation persists for months due to melanocyte overactivation.
TL;DR: Psoralens are photoreactive DNA intercalators. Keep citrus juice off your skin before sun exposure unless you want chemical burns that look like you lost a fight with UV radiation.
UVA photons hit psoralens → structural transformation → molecules intercalate into DNA strands → cell death cascade initiates. Reaction peaks 24-48h post-exposure with blistering and intense inflammation at contact sites.
Limes have the highest psoralen concentration, but lemons, celery, wild parsnip, parsley, and fig sap trigger the same pathway. Post-healing hyperpigmentation persists for months due to melanocyte overactivation.
TL;DR: Psoralens are photoreactive DNA intercalators. Keep citrus juice off your skin before sun exposure unless you want chemical burns that look like you lost a fight with UV radiation.