Contact allergy photopatch testing

Patch test and photopatch test — to rule out contact and photocontact allergy Immediate-type testing — to rule out contact urticaria... 

Pre-existing vesicular edematous cheilitis (probably due to contact allergy to the protecting lip salve) was aggravated after application of Zovirax cream (26). Patch tests to the lip salve were positive, but in addition there were positive photopatch tests to Zovirax cream, but not to its separate constituents. 

The photopatch test result is read as for plain patch tests. An area of significant controversy exists, however, in distinguishing photocontact allergy from plain contact allergy. The system used by the North American Contact Dermatitis Group is shown in Table 7. 

Gardiner JS, Dickson A, Macleod TM, Frain-Bell W (1972) The investigation of photocontact dermatitis in a dye manufacturing process. Br J Dermatol 86 264 Thune P (1984) Contact and photocontact allergy to sunscreens. Photodermatol Photoimmunol Photomed 1 5-9 Menz MB, Sigfrid AM, Connolly SM (1988) Photopatch testing a six-year experience. J Am Acad Dermatol 18 1044-1047... 

Hannuksela M, Kousa M, Pirill V (1976) Allergy ingredients of vehicles. Contact Dermatitis 2 105 Hasan T, Jansen CT (1996) Photopatch test reactivity effect of photoallergen concentration and UVA dosaging. Contact Dermatitis 34 383-386... 

Menz J, Muller SA, Connolly SM (1982) Photopatch testing a six-year experience. J Am Acad Dermatol 18 1044-1047 Merk H, Ebert L, Goerz G (1982) Allergic contact dermatitis due to the fungicide hexetidine. Contact Dermatitis 8 216 Meynadier JM, Meynadier J, Colmas A, et al. (1982) Allergie aux conservateur. Ann Derm Venereol 109 1017-1027... 

Tan KS, Mitchell JC (1968) Patch and photopatch tests in contact dermatitis and photodermatitis a preliminary report of investigation of 150 patients, with special reference to cedar-poisoning . Can Med Assoc J 98 252-255 Thune P (1977a) Allergy to lichens with photosensitivity. Contact Dermatitis 3 213-214... 

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