 The resulting uncontrolled HPV infections result in the growth of scaly macules and papules resembling tree bark, particularly on the hands and feet.It is typically associated with HPV types 5 and 8, which are found in about 80% of the normal population as asymptomatic infections, although other types may also contribute.The condition usually has an onset of between the ages of one and 20 but it can occasionally be present in middle age.