Contact dermatitis is an inflammatory response of the skin as a result of exposure to an exogenous agent. It is divided into two main types: 1. Contact Irritant Dermatitis (CID) 2. Contact Allergic Dermatitis (CAD). The prevalence of CAD in the general population has been reported to vary from 1.5-5.4%. The aim of the present study was to evaluate the precipitating and aggravating factors in CAD and study to evaluate the results of the patch test in patients having allergic contact dermatitis. Methods: A total of 50 patients of either sex with clinically suspected contact dermatitis who attended the Out Patient Clinic of Dermatology Department of Prathima Medical College, Nagnoor, Karimnagar. These patients were later subjected to a patch test after taking informed consent. The test units were thus prepared were stuck on the upper back of the patient in the vertical role in paravertebral position. Gentian violet was used for writing the numbers an occlusion of 48 hours was kept and the chambers were removed after the patient rendered to the clinic after 2 days. Results: The morphological pattern of lesions observed in Contact Dermatitis cases were Lichenification in male 40%, 18% was dry scaling 16% cases had erythema, cracking and fissuring. In female 32% had Lichenification and 22% had cracking and fissuring, dry scaling 24%, 16% each had erythema, papulovesicular and hyperpigmentation. Distribution of single and multiple antigens was studied in the patients. 76.92 % of the male had single antigen and 62.5% of the female was detected with a single antigen. Two antigens were found in 12.5% male and 4.16% female. Conclusion: Within the limitations of the present study it is concluded that contact dermatitis is very common in patients reporting to dermatology OPD. The most commonly affected were female house workers. Lichenification was the commonest morphological pattern followed by dry scaling, erythema, papulovesiculation, oozing, and depigmentation. Patch test was able to reveal the etiology in 70% of the patients. Potassium dichromate is the common sensitizer followed by Parthenium in this group of the population.