Hotlipz Instant Lip Plumping Serum The Hot Lipz Instant Lip Plumping Serum Is a Revolutionary Lip Plumper Giving You Plumper, Fuller and Softer Lips. It Increases the Size and Profile of Your Lips for Up To 12 Hours with Just One Application. The Hot Lipz Lip Plumping Serum Is a Great Way to Enhance the Profile of Your Lips Without the Need for Costly Fillers, Surgery or Potentially Dangerous Suction Methods.