Hello Gujar, it seems to me that you have got a problem deeper than just skin issues. If you have already consulted a doctor, it would not be unwise to see another one for a second opinion to investigate what issue is in your constitution that symptomises in the various ailments on the surface of your body.
Without knowing more about you, I would not presume your condition. However, generally if you have ulcer after coffee and black tea, the heat “qi” in the body is unbridled. According to what you have described, it could mean that both your “yin” and “yang” energies are low at the same time.
The safest teas to use are lower heat baked oolongs. For the oolongs, avoid those that are very green. In another word, choose oolongs that are neutral-cool in Traditional Chinese Medicine property. Occasional, but not frequent neutral and cool TCM teas are okay.
Hopefully a habit of such teas will not only help you retain moisture, but also improve your digestion and sleep quality for better health.
If my guess is correct, the black tea your have been using is the broken leaf Indian kind. The original tea leaf before processing is innocent. It is the kind of industrial processing and commercial re-processing that make the tea not good for health.
Please share any more questions, and how you are progressing.
