Objective: To analyze the effectiveness of phosphorus 32 ( Results: Lesions were divided into two groups with each group consisted of 26 lesions. Group A was treated with 32 P application whereas group B was treated with 10 mg/cc TA intralesional injection. Flattening of the lesion of more than 50% was higher in the group treated with 32 P application (76.9%) compared to the group that was treated with 10 mg/cc TA intralesional injection (57.7%) on the 8 th week, but the difference was not statistically significant (p>0.05). Conclusions:Based on the statistical analysis, the application of 32 P was as effective as the intralesional injection of 10 mg/cc TA for keloid lesions.