Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Pityriasis lichenoides et varioliformis acuta ?
    ### Response:
    How is pityriasis lichenoides et varioliformis acuta diagnosed? A diagnosis of pityriasis lichenoides et varioliformis acuta is often suspected based on characteristic signs and symptoms. A skin biopsy can be used to confirm the diagnosis. Additional laboratory testing may be ordered to investigate a possible cause such as an associated infection.
    