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This condition is called as oshthaprakopa according to Ayurveda. Oshthaprakopa is classified in 7 types (vata, pitta, kapha, vatapitta, vatakapha, and pittakapha, and vatapittakapha). You can get the diagnosis considering the symptoms. E.g, itching is due to kapha, burning is due to pitta, and pain (e.g. stabbing, piercing) may be due to pitta. colorwise, bright red is due to pitta, black color or color of rising sun (aruna varna) is due to vata, and whitish color is due to kapha. There are other factors like aggravating causes, season, and of course body type to be considered before coming to a final diagnosis. Also consideration of factors like dhatus, relation to menstrual cycle-if any, and habits, e.g., coffee as you have mentioned, is necessary.

There are some places in our body where mucous membranes join with skin. E.g, eyelids, and eyelashes, anus, and mouth. Lips are such a junction. These places are very peculiar. Some dosha complexes typically manifests here. E.g, fever, pitta+rasa dhatu, etc.

Although this is described as a minor disease, this could be really irritating problem. In my experience most of the patients present with pitta imbalance. It is always safe to use antipitta medications initially to treat this. I suggest virechana followed by internal treatment with combination of suvarnagairik, anantamula, and guduchisatva, and application of shata-dhauta-ghruta. For any further help mail me at cmthite@gmail.com