Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Reticulohistiocytoma ?
    ### Response:
    How is reticulohistiocytoma diagnosed? The diagnosis of reticulohistiocytoma (RH) is made based on clinical presentation, histology, and immunohistochemistry profile. RH occur in isolation and are typically described as small, yellow to reddish-born nodules.
    