In connection with the Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2020 of Castle Biosciences, Inc. (the “Company”), as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Frank Stokes, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge: | ||||||||||||||
| (1) | the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and | |||||||||||||
| (2) | the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. | |||||||||||||
| Date: | August 10, 2020 | /s/ Frank Stokes | ||||||
| Frank Stokes Chief Financial Officer (Principal Financial and Accounting Officer) | ||||||||
