How is natural hx of photosensitivity?

Occurs few hours after sunexposure. Located on sunexposed areas Photoallergy: eczema of suexposed areas with spreading on covered areas, induced by minimal sunexposure (MED very low) Phototoxicity: doses of drugs UVA dependent: actinic erythema, blisters.. Systemic : metabolic (porphyrias), lupus, polymorphous light eruption.