Exhibit 1

JOINT FILING AGREEMENT

 The undersigned hereby agree that the Statement on Schedule 13D, dated February 10, 2020, with respect to the ordinary shares of Arcutis Biotherapeutics, Inc. is filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. Each of the undersigned agrees to be responsible for the timely filing of this Statement, and for the completeness and accuracy of the information concerning itself contained therein. This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.

IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the 10^th day of February 2020.

ORBIMED ADVISORS LLC
By:	/s/ Carl L. Gordon
	Name: Carl L. Gordon
	Title: Member
ORBIMED CAPITAL GP VII LLC
By:	ORBIMED ADVISORS LLC, its Managing Member
By:	/s/ Carl L. Gordon
	Carl L. Gordon
	Title: Member of OrbiMed Advisors LLC
ORBIMED CAPITAL LLC
By:	/s/ Carl L. Gordon
	Carl L. Gordon
	Title: Member