A 45 year old farmer has itchyerythematous papular lesions on face, neck, 'V' area of chest, dorsmn of hands and forearms for 3 years.The lesions are more severe in summers and improve by 75% in winters. The most appropriate test to diagnos(.e.titil:) condition would be -
Skin biopsy
Estimation of IgE levels in blood
photo Patch Test
Intraderrnal prick test
The photo-patch test is conducted to examine the influence of rays when a chemical substance is placed on the skin. Twenty- four to 48 hours after a material that is suspected of causing pho- tosensitive disease is pasted on the skin, the site is exposed to UV rays. Ref Harrison20th edition pg 1234
Photosensitive disorders