1. An oil-in-water emulsion containing mometasone and propylene glycol, wherein the concentration of propylene glycol is from 20 to about 45% w / w. The oil-in-water emulsion according to claim 1, wherein the concentration of propylene glycol is from about 20 to about 40% w / w, for example, from about 20 to about 30% w / w. The oil-in-water emulsion according to claim 1 or 2, wherein the weight ratio between propylene glycol and water contained in the oil-in-water emulsion is from 1: 1 to about 1: 3.4. The oil-in-water emulsion according to claim 1 or 2, wherein the weight ratio between propylene glycol and water contained in the oil-in-water emulsion is from about 1: 1.5 to about 1: 2.5.5. An oil-in-water emulsion according to claim 1 or 2, wherein the mometasone or a pharmaceutically acceptable derivative thereof is the only therapeutically active ingredient. An oil-in-water emulsion according to claim 1 or 2, wherein a portion of mometasone or a pharmaceutically acceptable derivative thereof is present in undissolved form. An oil-in-water emulsion according to claim 1 or 2, wherein the mometasone is used in finely divided form. An oil-in-water emulsion according to claim 1 or 2, wherein the mometasone is present in the emulsion in a finely divided form. An oil-in-water emulsion according to claim 1, wherein the oil phase contains an oil selected from the group consisting of vegetable oils, animal oils, mineral oils, ester oils, silicone oils. The oil-in-water emulsion according to claim 9, wherein the oil is a vegetable oil. The oil-in-water emulsion according to claim 9, wherein the oil is a vegetable oil, which is coconut oil, olive oil, sunflower oil and / or canola oil. Oil-in-Water Emulsion1. Эмульсия "масло-в-воде", содержащая мометазон и пропиленгликоль, где концентрация пропиленгликоля составляет от 20 до приблизительно 45% мас./мас.2. Эмульсия "масло-в-воде" по п.1, где концентрация пропиленгликоля составляет от приблизительно 20 до приблизительно 40% м