13G Filing: Great Point Partners and Foamix Pharmaceuticals Ltd (FOMX)

Exhibit A

AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE
13G/A

The undersigned hereby agree as follows:

(i)          Each
of them is individually eligible to use the Schedule 13G/A to which this Exhibit is attached, and such Schedule 13G/A is filed
on behalf of each of them; and

(ii)         Each
of them is responsible for the timely filing of such Schedule 13G/A and any amendments thereto, and for the completeness and accuracy
of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of
the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information
is inaccurate.

Date: May 10, 2017