Related Clues:

• Lint-collecting navel
• Outie's opposite
• Protuberant navel
• Convex navel
• Umbilical concavity
• Navel variety, familiarly
• Protruding belly button
• Protruding navel, in slang
• Midriff protuberance
• Concave tummy part
• Concave bellybutton
• Tummy protrusion
• 'Button' that's plainly visible
• One of a select group
• Umbilical variety