Exhibit 8.2

Chrysler Center

666 Third Avenue

New York, NY 10017

mintz.com

October 29, 2019

NeuroBo Pharmaceuticals, Inc.

177 Huntington Avenue, Suite 1700

Boston, MA 02115

Ladies and Gentlemen:

We have acted as counsel to NeuroBo Pharmaceuticals, Inc., a Delaware corporation (“NeuroBo”) in connection with the Agreement and Plan of Merger and Reorganization dated as of July 24, 2019, as amended (the “Agreement”), among NeuroBo, Gemphire Therapeutics Inc., a Delaware corporation (“Gemphire”), and GR Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of Gemphire (“Merger Sub”).

This opinion is being delivered to you in connection with the filing of a registration statement of Gemphire on Form S-4 with the Securities and Exchange Commission (as amended and supplemented through the date hereof, the “Registration Statement”), which includes the joint proxy statement/prospectus/information statement relating to the Agreement. Except as otherwise provided, capitalized terms not defined herein have the meanings set forth in the Agreement.

In our capacity as counsel to NeuroBo in the Merger, and for purposes of rendering this opinion, we have examined and relied upon (i) the Agreement, (ii) the Registration Statement, (iii) the tax representation letters delivered to us by Gemphire, Merger Sub, and NeuroBo containing certain factual representations relevant to this opinion (the “Representation Letters”), and (iv) such other documents as we considered relevant to our analysis, including all of the exhibits, schedules, and attachments to the foregoing documents. In our examination of documents, we have assumed the authenticity of original documents, the accuracy of copies, the genuineness of signatures, and the legal capacity of signatories.

We have assumed that all parties to the Agreement and to any other documents examined by us have acted, and will act, in accordance with the terms of such Agreement and documents and that the Merger will be consummated at the Effective Time pursuant to the terms and conditions set forth in the Agreement without the waiver or modification of any such terms and conditions. Furthermore, we have assumed that all representations contained in the Agreement, as well as those representations contained in the Representation Letters, are, and at the Effective Time will be, true, correct and complete in all material respects, and that any representation made in any of the documents

referred to herein “to the best knowledge” (or similar qualification) of any person or party will be correct without such qualification. We have also assumed that as to all matters for which a person or entity has represented that such person or entity is not a party to, does not have, or is not aware of, any plan, intention, understanding, or agreement, there is no such plan, intention, understanding, or agreement. We have not attempted to verify independently such representations, but in the course of our representation, nothing has come to our attention that would cause us to question the accuracy thereof.

The conclusions expressed herein represent our judgment as to the proper treatment of certain aspects of the Merger under the income tax laws of the United States based upon the Internal Revenue Code of 1986, as amended (the “Code”), Treasury Regulations, case law, and rulings and other pronouncements of the Internal Revenue Service (the “IRS”) as in effect on the date of this opinion. No assurances can be given that such laws will not be amended or otherwise changed prior to or after the Effective Time or that such changes will not affect the conclusions expressed herein. Nevertheless, we undertake no responsibility to advise you of any developments (including changes that have retroactive effect) after the Effective Time in the application or interpretation of the income tax laws of the United States.

Our opinion represents our best judgment of how a court would decide if presented with the issues addressed herein and is not binding upon either the IRS or any court. Thus, no assurances can be given that a position taken in reliance on our opinion will not be challenged by the IRS or rejected by a court.

Based solely upon and subject to the foregoing, we hereby confirm that (i) the Merger shall qualify either as (a) a tax-free contribution pursuant to Section 351 of the Code, or (b) as a “reorganization” within the meaning of Section 368(a) of the Code and (ii) the discussion contained in the Registration Statement under the heading “The Merger—Material U.S. Federal Income Tax Consequences of the Merger” pertaining to the U.S. federal income tax consequences of the Merger, insofar as such discussion constitutes statements of U.S. federal income tax law or legal conclusions, in each case, subject to the assumptions, limitations and conditions set forth in the Registration Statement, represents our opinion as to the material U.S. federal income tax consequences of the Merger to U.S. Holders (as defined in the Registration Statement) of NeuroBo common stock.

Our opinion is limited to the conclusions as expressly set forth above and we express no other opinion regarding the tax consequences of the Merger. We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and further consent to the use of our name in the Registration Statement in connection with references to this opinion and the tax consequences of the Merger. In giving this consent,

however, we do not hereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules and regulations thereunder.

Sincerely,

/s/ MINTZ, LEVIN, COHN, FERRIS, GLOVSKY AND POPEO, P.C.

MINTZ, LEVIN, COHN, FERRIS, GLOVSKY AND POPEO, P.C.