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Fitzpatrick's Color Atlas & Synopsis of Clinical Dermatology, 6e
Section 10. Photosensitivity, Photo-Induced Disorders, and Disorders by Ionizing Radiation
Sections: Skin Reactions to Sunlight, Systemic Phototoxic Dermatitis, Topical Phototoxic Dematitis, Phytophotodermatitis (PPD), Polymorphous Light Eruption, Solar Urticaria, Photoexacerbated Dermatoses, Metabolic Photosensitivity—the Porphyrias, Chronic Photodamage, Skin Reactions to Ionizing Radiation.
Topics Discussed: photosensitivity; radiation, ionizing.
Excerpt:
"ICD-9 : 692.70  ICD-10 : L56.8The main culprit of solar radiation–induced skin pathology is the ultraviolet portion of the solar spectrum. Ultraviolet radiation (UVR) in photomedicine is divided into two principal types: UVB (290–320 nm), the "sunburn spectrum," and UVA (320–400 nm). UVA is subdivided into UVA-1 (340–400 nm) and UVA-2 (320–340 nm). The unit of measurement of sunburn is the minimum erythema dose (MED), which is the minimum ultraviolet exposure that produces a clearly marginated erythema in the irradiated site 24 h after a single exposure. The MED is expressed as the amount of energy delivered per unit area: mJ/cm2 (UVB) or J/cm2 (UVA). The MED for UVB in Caucasians is 20–40 mJ/cm2 (for a skin phototype I or II, about 20 min in northern latitudes at noon in June) and for UVA is 15–20 J/cm2 (about 120 min in northern latitudes at noon in June). UVB erythema develops in 6–24 h and fades within 72–120 h. UVA erythema develops in 4–16 h and fades within 48–120 h.See Table 10-2.Sunburn depends on the amount of UVR energy delivered and the susceptibility of the individual..."
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