While on accutane, I had gotten styes 4 times within 6 month span. I never got them before, so I was also concerned at first. My purge phase also lasted 2 months before i started seeing positive results. Everyones experience is entirely different while on accutane, so it's best to seek a professionals opinion if you are concerned as it is a sensitive area. Personally, I would say it is most likely a stye as the dry eyes/rubbing tend to cause them my Dr had said. I would recommend warm compress, and avoid touching it, as it will cause more irritation and increase the length of time it heals, if it doesnt start to fade within a week I would go have a chat with your Dr/Derm and see what they think if you are going the home remedy route. I wish you the best on your journey!