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 -
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
Skin biopsy
Estimation of IgE levels in blood
photo Patch Test
Intraderrnal prick test
Photosensitive disorders