<prompt> Elderly man with a long standing mole over the face which is increasing in size and showing irregular borders DiagnosisLentigo malignaSuperficial spreading melanomaAcral melanomaNodular melanoma  <response>: superficial spreading melanoma is the most common type of malignant melanoma and it is also the most reommon type which occursin a patient with a pre existing mole. ref : bailey and love 27th ed 