Should I get a second opinion 1.5 weeks after inner thigh lipo and scab? (Photo)

Thank you for your question.  This could be a number of different things including a burn, bruising, reaction to something, and or possible skin necrosis.  I would continue to follow up with your surgeon and if you feel more comfortable seeking a second opinion then by all means do what makes you comfortable.  Make sure you address what your concerns are and how to treat the issue.  Best of luck to you. 

Scabs after lipo are usually caused by  burns (possible with Vaser or laser) or friction from inappropriate garment or very unlikely superficial necrosis of skin usually in heavy smokers

It is impossible to make a diagnosis without seeing you in person, however this looks like a lipo burn, not an allergic reaction.  Perhaps a second opinion may be a reasonable thing.