An oil-in-water emulsion for application on a skin surface is disclosed. The emulsion comprises an oily phase and an aqueous phase. The oily phase comprises a first lipid of vegetable or animal origin. The emulsion is stabilized by containing at least one surfactant/emulsifier. The surfactant/emulsifier is substantially removed from a skin surface onto which the emulsion has been applied and from the emulsion by flushing with a liquid, thereby leaving at least a part of the oily phase on the skin. When the emulsion is diluted with tap water, which has a degree of hardness of about 18 degrees in a volume of 100 parts of water to one part of the emulsion at ambient temperature, it is separated into at least two distinct phases after standing for 24 hours at ambient temperature. The emulsion has a pH value of at least about 6 and at least about 50% w/w of the total concentration of the surfactant/emulsifier which is a fatty acid derivative. The fatty acid derivative has a fatty acid component which is a saturated or unsaturated C
hydrocarbon carboxylic acid or mixtures thereof. The emulsion can be used in a method for cleansing or conditioning a skin surface, for treating human skin, for treating mammals against parasites belonging to the phylum Arthropoda and for protecting human skin against the sun.