Criteria
for melanocytic lesion

• Pigment network - pseudonetwork
  (See exception 1)
• Aggregated globules
  (not multiple blue-gray globules)
• Branched streaks
• Homogeneus blue pigmentation
  (See exception 2)
• Parallel pattern
  (on palms/soles and mucosal areas)

Criteria
for seborrheic keratosis

• Multiple milia-like cysts
• Comedo-like openings
  (irregular crypts)
• Light-brown fingerprint-like structures
• Fissures/ridges
  (brain-like appearance)

Criteria
for basal cell carcinoma

• Absent pigment network
  AND one of:
• Arborizing vessels
• Leaf-like areas
• Large blue-gray ovoid nests
• Multiple blue-gray globules
• Spoke wheel areas
• Ulceration (See exception 3)

Criteria
for vascular lesion

• Red-blue lacunas
• Red-bluish to red-black
  homogeneus areas

None of the listed criteria