- Adult Skin Problems Slideshow
- Quiz: Is Ringworm Contagious?
- Gallery of Skin Problems Pictures
- Patient Comments: Sun-Sensitive Drugs - Phototoxic Drugs
- Patient Comments: Sun-Sensitive Drugs - Symptoms
- Patient Comments: Sun-Sensitive Drugs - Treatment
- Patient Comments: Sun-Sensitive Drugs - Foods and Plants
- Sun-sensitizing drugs (photosensitivity) facts
- What is photosensitivity?
- What is the difference between a photoallergic and a phototoxic reaction?
- What is ultraviolet light?
- Photoallergic and phototoxic reaction pictures
- What are the symptoms of sun sensitivity (photosensitivity)?
- Phototoxic drugs
- Photoallergic drugs
- Are there any medical conditions that may cause photosensitivity?
- How is sun sensitivity (photosensitivity) diagnosed?
- What is the treatment for a photosensitizing drug reaction?
- Is anyone taking these drugs at risk for developing sunburn?
- Can any foods or plants cause sun sensitivity (photosensitivity) reactions?
- Pictures of food and plant sun-sensitivity (photosensitivity) reactions
- Are there any medical applications of sun sensitivity (photosensitivity)?
Some of the common topical photoallergic drugs are the following:
- para-aminobenzoic acid (PABA) - PABA has been phased out of sunscreen preparations because of the high rate of allergic reactions to this chemical.
Cancer chemotherapy drugs
- 5-fluorouracil (5-FU, Efudex, Carac, Fluoroplex)
These are only some of the common sun-sensitizing drugs.
Are there any medical conditions that may cause photosensitivity?
Some medical conditions are known to cause sensitivity to sun exposure.
Systemic lupus erythematosus (SLE) often causes a rash on the face which can be very sensitive to sunlight. This rash is typically seen on the nose and cheeks, called a malar rash, and is considered one of the hallmarks of lupus.
Porphyria is another medical condition that may cause photosensitivity reactions. This is a hereditary condition with skin manifestation (cutaneous porphyria) causing rashes and blisters in reaction to exposure to sunlight.
Xeroderma pigmentosum is a disorder that appears to result from an inherited hypersensitivity to the cancer-causing (carcinogenic) effects of ultraviolet light. Sunlight causes DNA damage that is normally repaired. Individuals with xeroderma pigmentosum have defective inability to repair the DNA after UV damage. Affected individuals are hundreds of times more vulnerable to developing skin cancer than other people. Their extreme skin photosensitivity predisposes them to pronounced skin damage and scarring and also to the early onset of skin cancer (basal cell and squamous cell carcinomas and malignant melanoma).
Individuals with classic oculocutaneous albinism lack melanin in their skin and eyes -- hence, the term "oculocutaneous" ("oculo" for eyes, and "cutaneous" for skin). Without the protection of this pigment, their white skin and pink eyes are both highly sensitive to UV and susceptible to the rays' damage.