Exhibit 24

POWER OF ATTORNEY

KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and appoints Thomas Paulson, Justin Hall, Mistie Fain and certain other members or persons associated with Novabay Pharmaceuticals, Inc., and each of them, with full authority to act without the others, as the undersigned's true and lawful attorneys-in-fact to:

(1) execute for and on behalf of the undersigned, in the undersigned's capacity as a reporting person pursuant to Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and the rules thereunder, of NovaBay Pharmaceuticals, Inc. (the "Company"), Form ID and Forms 3, 4 and 5 in accordance with Section 16(a) of the Exchange Act;

(2) do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form ID and Form 3, 4 or 5 and file such form with the United States Securities and Exchange Commission and any stock exchange or similar authority or organization; and

(3) take any other action of any type whatsoever in connection with the foregoing which, in the opinion of any of such attorneys-in-fact, may be of benefit to, in the best interest of, or legally required of, the undersigned, it being understood that the documents executed by any of such attorneys-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as any of such attorneys-in-fact may approve in the sole discretion of any of such attorneys-in-fact.

The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that any of such attorneys-in-fact, or the substitute or substitutes of any of such attorneys-in-fact, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Exchange Act.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 5th day of March, 2013.

Signature: /s/ T. Alex McPherson

Print Name: T. Alex McPherson, M.D. Ph.D.

STATE OF CALIFORNIA

COUNTY OF ALAMEDA

On March 5, 2013, before me, Sarina Tortoriello, Notary Public, personally appeared T. Alex McPherson, who proved to me on the basis of satisfactory evidence to be the person whose name is subscribed to the within instrument and acknowledged to me that he executed the same in his authorized capacity, and that by his signature on the instrument the person, or the entity upon behalf of which the person acted, executed the instrument.

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature /s/ Sarina Tortoriello

NovaBay Pharmaceuticals, Inc. 4