I understand your anxiety over this situation. Your aesthetician could very well be correct. It all depends on the special blend of oils that she used to massage your face, as well as what kind of skin you have. If the special blend she used contained a high concentration of medicinal grade essential oils like lemongrass, which in itself is very antibacterial, it could actually help tone and clear the pore. The other half of the equation refers to the carrier oil used as the base of the blend. If it is a grapeseed oil which is a more micronized form of therapeutic oil, it will not clog the pore because it penetrates into the dermis of the skin instead of setting on top of the epidermis creating a barrier that prevents oxygen from entering and keeping impurities out. If she used a carrier oil such as mineral oil, or coconut oil, you very well may have a breakout from that ingredient alone if you are prone to blackheads. I myself create my own blend and have for the duration of my career, but it is heavily formulated with antioxidant, antibacterial, anti-inflammatory and tiny monosaccharide chained oils to deeply nourish, tone, and treat open pores after extractions. These ingredients tend to be much more expensive than the common ‘filler’ ingredients found in many mass produced massage oils for the public. There is also the protocol following the massage. Your esthetician could have used an enzymatic ingredient like Papain derived from the papaya fruit to massage into the skin to soften and loosen debris from the pores as a pre extraction massage to facilitate the ease of unpacking blackheads and gently sloughing dead cells from your epidermis to leave you with that healthy glow. Then using the right toning mask to close the pores afterwards. Without knowing her formula I cannot say for sure whether or not you will have an adverse reaction to your facial, but I can suggest that if you have a relationship with your esthetician and you trust that she knows your skin and her trade than you probably have nothing to worry about. Next time just ask her what the ingredients are in her concoction, as is your right to know what is being used on your face. I guess the short answer to your question is; some oils are very good for your skin if used in the right proportion to essential oils which counteract the negative clogging effects of lipophilic ingredients on their own and aestheticians are trained to use appropriate protocol per individual situation and skin. I would go to someone you trust, ask questions, and if you are getting the desired results stick with her, as her knowledge of your skin will grow into a symbiotic relationship for you both.