Soft tissue enlargement of the oral cavity usually existent a diagnostic challenge because many group of pathologic activity can cause these lesions. An enlargement may display a variation of normal anatomic structure, cyst, inflammation, developmental anomalies and neoplasm. These lesions included a group of reactive hyperplasia which arises in response to recurring; chronic tissue injury that provokes vigorous or extreme tissue repair response .so pyogenic granuloma is one of the many common entities in charge of soft tissue enlargement. Objective: The current study aimed to detect the immunohistochemical expressions of ER and alpha smooth muscle actin (α-SMA) for lobular capillary hemangioma (pyogenic granuloma). Material and Methods: fifty cases of confirmed diagnostic pyogenic granuloma were subjected to immunohistochemically assessment by using ER marker and Smooth Muscle Actin marker. Result: The immunohistochemically finding appeared that all 50 cases were positive for SMA marker while only 14 cases were positive for ER marker. So there is no significant difference between ER marker in relation to clinical parameters (age, gender and location) and intensity.