Background Histopathology using skin biopsy is still the basis of diagnosis for most neoplasms and many inflammatory dermatoses despite molecular advances. Methods The patients of all age group with clinical diagnosis of inflammatory lesions were included in the study.The cutaneous lesions of 190 patients were biopsied using punch biopsy technique with the aim to diagnose and categorize them using Ackerman AB’S (1978) algorithmic classification for inflammatory dermatoses.and to study their relative frequency. Results Categorization of the lesions into 9 major basic patterns using AB Ackerman’s criteria for pattern analysis with definite diagnosis was done in 175 cases out of 190 patients. Male preponderance was noted with maximum cases in 31–40 yrs of age group with most frequently observed diagnosis of leprosy with commonest pattern of nodular and diffuse dermatitis. Conclusion: Use of pattern analysis makes the histological diagnosis easier and reproducible.