Introduction: Edgeoscopy is the study of edges of ridges of finger prints. Ridges are present on the friction ridge skin on the distal end of digits, palms and soles in the hands and feet. Materials and methods: The present study is carried out with a sample size of 400 undergraduates of first year MBBS students of Bhopal region of both sexes. Under the age between18 to 23. Left side thumb finger print would be taken with printer’s ink (Kores ink) on executive bond paper and the above prints are subjected with chemical (Ninhydrin) and studied under microscope (latent prints). The microscopic findings are recorded and examined carefully. Concave edges of left side are studied under microscope and images were taken. Results: According to our findings the concave edges present in 1 cm ridge of left side thumb impression in both male and females. We found the highest number concave edges are 1 in 1 cm ridge .Out of 200 males 160 males shows 1 concave edge in 1 cm ridge. Which is higher than the females? Out of 200 females 126 female shows 1 concave edge in 1 cm ridge. So the study of concave edges may helpful in sex determination. Conclusion: study of shapes of ridges on thumb impressions is the best method for determination of sex. Edgeoscopy can also helpful in anthropology forensic medicine, anatomy of finger prints, and forensic sciences.