Background Non-Hodgkin lymphoma (NHL) frequently presents as extra-nodal involvement, although primary diffuse large B cell lymphoma of extra-nodal origin is a distinct entity. Different subtypes may have propensity for specific anatomic locations. In the head and neck region, diffuse large B cell lymphoma (DLBCL) is most commonly presented in the paranasal sinuses, jaws, and Waldeyer’s ring. DLBCL involving fibroadipose tissue and presenting as an extra-nodal mass is extremely unusual, particularly in the head and neck region. Case presentation We will present a case of forehead mass as presenting features of a highly aggressive B cell lymphoma. Conclusion Although soft tissue DLBCL presenting as scalp mass is rare, it should be considered in differential diagnosis of every soft tissue lump.