Grand Strand Dermatology, LLC. Patient Portal. Patient Portal. Online Payment. 3001 Newcastle Loop. Myrtle Beach, SC 29588 (843) 215-1100. 933 Medical Circle. Myrtle Beach, SC 29572 (843) 215-1100. 843-215-1211. Patient Portal. Please register for access to your patient portal. Complete your necessary paperwork prior to appointment by clicking ....