PROBLEM TO BE SOLVED: To provide foaming external preparations for skin which are easy to handle and which are excellent in stability and durability without causing problems of unexpected generation of carbonic acid gas when producing or storing foaming external preparations for skin, in a foaming external preparation for skin containing an acidic substance and a carbonic acid gas generation substance which generates carbonic acid gas in reaction with the acidic substance.SOLUTION: Provided is a one-formulation type or a multi-formulation type of two or more formulation type foaming external preparation for skin, characterized by containing at least acidic substance and a carbonic acid gas generation substance which generates carbonic gas in reaction with the acidic substance in either the same formulation, and by compounding the acidic substance and the carbonic gas generation substance so as not to contact physically each other, or so as not to contain moisture in the same formulation.SELECTED DRAWING: None【課題】取り扱いが簡便で、酸性物質と前記酸性物質と反応して炭酸ガスを発生する炭酸ガス発生物質とを含有する発泡性皮膚外用剤において、発泡性皮膚外用剤の製造時や保管時に予期せぬ炭酸ガスの発生という問題を生じることがない、安定性、耐久性に優れた発泡性皮膚外用剤を提供すること。【解決手段】一剤型、又は、二剤以上の多剤型の発泡性皮膚外用剤であって、いずれか同一剤内に少なくとも酸性物質と前記酸性物質と反応して炭酸ガスを発生する炭酸ガス発生物質とを含有し、前記酸性物質と前記炭酸ガス発生物質が互いに物理的に接触しないように配合すること、もしくは、前記同一剤内に水分を含有しないようにすることを特徴とする。【選択図】なし
