Does anyone insured with Swisscare (the foreign students insurance) know what is the procedure when one needs to visit a specialist doctor (e.g. dermatologis, opthamologist)? Do I need to go to the GP first, or can I go directly to the doctor of my choice? What is your experience in that case?

Probably best to call them and ask what kind of policy you have. Even then, I'd always go to my GP first, as they know the best specialist to send you to, rather than you guessing.